21st Patras Workshop on Axions, WIMPs and WISPs

8 Nov 2026, 18:00 → 13 Nov 2026, 15:00 Australia/Perth

University of Western Australia

Michael Tobar (The University of Western Australia)

For news on Quantum, see: https://qnews.io/

Quantum Tech Goes Hunting for Dark Matter in Perth

**Important information and dates 2026:**

• Abstract Submission is closed.
• Registration Payments to be made at: https://payments.uwa.edu.au/StandardPATRA2026Registration
• REGISTRATION is now closed; contact the organisers for possible exceptions.
• 08 November: Welcome Reception.
• 09 – 13 November: 21st Patras Workshop.

Topics Include

• Axions and Wave-Like-DM (WISPs)
• WIMPs
• Other DM
• Astrophysics/Astronomy
• Experiment
• Theory

 

For a history of the workshop, see:

https://axion-wimp2026.desy.de/   

https://axion-wimp2026.desy.de/previous_workshops/

From the Standard Model of particle physics to concordance cosmology, many of the most compelling ideas about how the universe works now point toward a rich and elusive dark sector. The 21st Patras Workshop on Axions, WIMPs and WISPs, hosted by The University of Western Australia at its Crawley campus on the banks of the Swan River in Perth, will be held from 9–13 November 2026, and will gather leading experts and emerging researchers to probe this frontier. Continuing a distinguished series that began at CERN in 2005, the workshop will focus on innovative theoretical developments, laboratory and astrophysical searches for dark matter and dark energy, and state-of-the-art efforts to uncover new weakly interacting particles and constrain their properties. This edition will highlight the growing Australian and Asia–Pacific contributions to dark sector physics, drawing on UWA’s strong ecosystem in precision measurement, quantum technologies and astroparticle physics.

A highlight of the workshop will be a plenary lecture by the 2025 Nobel Laureate, Prof. John M. Martinis, whose pioneering work in superconducting quantum circuits has transformed modern quantum measurement science. 

For news on Quantum, see: https://qnews.io/

Code of Conduct

The workshop is dedicated to providing a discrimination- and harassment-free experience for all attendees. All speakers and participants are expected to comply with the CDM code of conduct

CANCELLATION:
All refund requests must be in writing by mail to the Conference Secretary and Chair as soon as possible. The Conference committee reserves the right to refuse reimbursement of part or all of the fee in the case of late cancellation. However, each case of cancellation would be considered individually

Sunday 8 November

18:00 → 21:00 Welcome Reception

Monday 9 November

08:00 → 08:30 Registration: Arrival Tea & Coffee and Cultural Welcome Ceremony

08:30 → 09:00 Smoking Ceremony

09:00 → 09:30 Monday Morning Sessions: Conference Welcome and Opening: Chair; Michael Tobar

09:30 → 10:10 Plenary Talk

09:30 Status and Future of the Axion Dark Matter Experiment (ADMX)

QCD axions are the resulting bosons from the Peccei-Quinn mechanism which solves the strong CP problem, and are also a convincing candidate for wavelike dark matter. Located at the University of Washington, the Axion Dark Matter Experiment (ADMX) is an axion haloscope currently probing axions at Dine-Fischler-Srednicki-Zhitnitskii (DFSZ) sensitivities from 1.02 to 1.39 GHz (4.22 - 5.75 µeV). ADMX will employ a four cavity system for its next phase, run 2A, which operates at a higher frequency (1.39 - 1.9 GHz) compared to the current operations. Following run 2A, we are considering the potential technological upgrades for future detectors that search the wider axion parameter space.

Speaker: Andrew Yi (SLAC National Accelerator Laboratory)

10:10 → 10:30 Tea & Coffee Break

10:30 → 12:00 Monday Morning Sessions

10:30 SABRE South at SUPL Status and Physics Prospects

SABRE South is located at the Stawell Underground Physics Laboratory (SUPL), the only deep underground laboratory in the Southern Hemisphere, 1025 m underground (~2900 m water equivalent) in the Stawell Gold Mines, Victoria. The detector uses ultra-high-purity NaI(Tl) crystals with purity comparable to DAMA, combined with an active liquid scintillator and muon veto system. Together with its Northern Hemisphere twin, SABRE North (LNGS, Italy), SABRE South enables a dual-hemisphere test of the dark matter annual modulation signal, distinguishing a genuine signal from seasonal backgrounds — possible only with a Southern Hemisphere detector.
Once stable data taking begins in January 2027, SABRE South will deliver a definitive test of the DAMA/LIBRA annual modulation signal at high statistical significance. Beyond this primary goal, the experiment's low background and crystal purity will enable searches for low-mass dark matter via the Migdal effect and absorption-based detection, and will provide sensitivity to galactic core-collapse supernova neutrinos as part of the SNEWS network.
This talk will present SABRE South's detector performance — including NaI(Tl) crystal purity, background levels, and muon flux measurements — its commissioning status, and physics reach.

Speaker: Prof. Elisabetta Barberio (University of Melbourne)

10:50 The COSINUS Experiment: From Commissioning Towards First Dark Matter Data

COSINUS is a cryogenic direct detection experiment for dark matter located at the Laboratori Nazionali del Gran Sasso (LNGS) Underground Laboratory in Italy. Its primary goal is to provide a model-independent crosscheck of the long-standing annual modulating claim by DAMA/LIBRA. Therefore, COSINUS uses the same absorber material (NaI) as in DAMA/LIBRA, but operates it with a two-channel calorimetric readout.

A key feature of COSINUS is the novel remoTES design, that allows the operation of highly sensitive Transition Edge Sensors (TESs) also with hygroscopic absorbers such as NaI. Here, the TES is fabricated on a separate wafer and thermally coupled to the designated absorber with a gold wire. For each particle interaction, the remoTES is measuring the phonon response, while a separate beaker, also equipped with a TES, measures the scintillation light of the same event. Hence, this two-channel readout enables an event-by-event discrimination between electron/gamma backgrounds and nuclear recoils. Moreover, this readout allows in-situ measurements of the quenching factors, providing a key advantage over DAMA/LIBRA.

COSINUS is currently in the commissioning phase for the first run and physics data taking is expected to start in the last quarter of the year 2026. This talk will give an overview of the experimental concept, presents the current status of the experiment and concludes with an insight on future improvements in COSINUS.

Speaker: Alexander Bohmer (Vienna University of Technology (AT))

11:05 Dark Matter Search with Optical Quantum Sensors

Optical Quantum Sensors (OQS) are extremely sensitive ambient-temperature magnetometers which can be applied in axion dark matter searches using an inductor-capacitor (LC) circuit. At Los Alamos National Laboratory, we recently proposed to develop a sensitive search for ultralight axion dark matter by pushing OQS sensitivity to a world first level of 60 aT/Hz$^{1/2}$. Combining this OQS with a low-temperature LC circuit in a 2 T magnet at the University of Florida, we will develop a pathfinder experiment to demonstrate the use of OQS in searches for ultralight dark matter axions. We present an overview of our axion detection experiment and its projected experimental sensitivity. We have previously conducted a feasibility test with a large-bore magnet, a room-temperature LC circuit, and a commercial OQS module with 10 fT/Hz$^1/2$ sensitivity and also report on this work.

We acknowledge this work was supported by Quantum Information Science Enabled Discovery 2.0 (QuantISED 2.0) for the United States Department of Energy, Office of Science, Office of High Energy Physics (DE-FOA-0003354). LA-UR-26-25359.

Speaker: Dr Leanne Duffy (Los Alamos National Laboratory)

11:20 Recent results from the LUX-ZEPLIN (LZ) experiment

Dual-phase xenon time projection chambers are the leading technology in the search for WIMP dark matter. The LUX- ZEPLIN (LZ) experiment is the largest of its kind currently operating, deploying a 7 tonne liquid xenon active volume and two veto subsystems deep underground at the Sanford Underground Research Facility in Lead, South Dakota, USA. LZ currently boasts world-leading constraints on dark matter above 5 GeV/c$^2$, as well as the world’s most statistically significant observation (at 4.5 $\sigma$ significance) of solar $^8$B coherent elastic neutrino-nucleus scattering (CE$\nu$NS). This talk presents the latest results from the LZ experiment, with a particular focus on the recent low-threshold search for low mass WIMPs and solar $^8$B CE$\nu$NS.

Speaker: Robert James (The University of Melbourne)

11:40 XLZD - the next-generation dark matter and rare event observatory

Currently running two-phase xenon time-projection chambers are at the forefront of the search for dark matter interactions via nuclear recoils in the mass range above a few $\textrm{GeV}/\textrm{c}^{2}$. The XLZD collaboration brings together the expertise of the XENON, LUX-ZEPLIN and DARWIN collaborations to construct a next-generation experiment capable of exploring the WIMP parameter space down into the neutrino fog. Additionally, the experiment will have globally competitive sensitivity to the neutrino-less double-beta decay of $^{136}\textrm{Xe}$ and enable precision studies of solar neutrinos. In this talk, I will present the scientific goals of XLZD, alongside the status of R&D and experimental design.

Speaker: Theresa Fruth (University of Sydney)

12:00 → 13:15 Lunch Break

13:15 → 15:00 Monday Afternoon Session

13:15 SQMS results for widely-tunable SRF DPDM haloscope and progress towards Itinerant Photon Counters

The Superconducting Quantum Materials and Systems Center (SQMS) recently conducted a Dark Photon Dark Matter search in the 4.5 GHz to 7.1 GHz range using a widely-tunable superconducting haloscope. I will present the cavity design and characterization, analyze the impact of microphonics on system performance and haloscope sensitivity, and describe our tuning methodology for this Q~10^8 cavity. The presentation will cover our haloscope analysis approach and discuss exclusions achieved in this frequency range. I will outline lessons learned from this first search, implications for future axion searches, and proposed improvements for subsequent SERAPH experiments.

Finally, I will first discuss efforts to implement an itinerant photon counter to subvert the Standard Quantum Limit noise and increase the haloscope scan rate by potentially orders of magnitude.

Speaker: Raphael Cervantes

13:35 The SuperCDMS SNOLAB experiment

SuperCDMS SNOLAB is a cryogenic experiment projected to achieve world-leading sensitivity for dark matter masses below 10 GeV using semiconductor crystal detectors. The experiment employs two detector types - iZIP detectors with combined phonon and charge readout providing excellent nuclear recoil/electron recoil discrimination, and HV detectors which amplify phonon energy proportional to an applied external electric field to achieve lower detection thresholds. Commissioning of the full twenty-four detector payload, comprising both silicon and germanium iZIP and HV detectors, began in early 2026. This talk will give an overview of the experiment and present the latest results as well as ongoing R&D aimed at developing the next generation of low-background detectors.

Speaker: Peter McNamara

13:55 ORGAN-Low : Pathfinder Search for Sub-μeV Axion Dark Matter with the Re-entrant Haloscope Design

The QCD axion remains one of the most compelling dark matter candidates, offering a simultaneous solution to the Strong CP problem and the nature of dark matter. Axion haloscopes search for this particle through its resonant conversion into microwave photons in a strong magnetic field, but most mature experimental sensitivity has so far been concentrated at GHz frequencies. The lower-frequency region around a few hundred MHz, corresponding to axion masses in the sub-to-few $\mu$eV range, remains comparatively under explored because it requires large volume, high quality factor resonators with experimentally viable coupling, mode control, and low noise readout performance.
In this work, we report the design, construction, commissioning, and first pathfinder search using a prototype low-frequency axion haloscope operating in the 450-460 MHz range, corresponding to axion masses of approximately 1.86-1.90 $\mu$eV. The prototype is a one-fifth linear scale version of our planned full-scale detector, developed as a pathfinding platform to validate the detector design, readout chain, data acquisition strategy, and analysis framework before scaling to the final experiment. The detector is based on a resonant cavity architecture optimized for low frequency operation, with detailed characterization of the relevant electromagnetic mode structure, loaded quality factor, coupling, receiver response, and system noise.
Using data collected with the prototype detector, we perform a pathfinding axion search across the 450-460 MHz band and derive experimental sensitivity limits in this previously experimentally unexplored mass range. The analysis demonstrates that low-frequency haloscope searches can be made experimentally feasible with a compact prototype platform while achieving meaningful sensitivity to axion dark matter. These results provide an experimentally validated foundation for the next stage of the program: a full-scale detector with substantially enhanced sensitivity and broader frequency coverage, targeting the 100-500 MHz range. By demonstrating both the performance of the prototype and the scalability of the detector concept, this work establishes a practical route toward probing currently inaccessible regions of low-mass axion dark matter parameter space.

Speaker: Raj Aryan Singh (Swinburne University of Technology)

14:10 Lohengrin —a proposed experiment in the search for dark bremsstrahlung and a portal to the dark sector

The non-discovery of WIMPs at the LHC and the negative outcome of direct detection experiments have led to a steadily increasing interest in models with light dark matter. Models with a dark matter candidate that has a mass below the Lee-Weinberg bound can predict the right dark matter relic density if a new gauge interaction is introduced in addition to the dark matter candidate. The new gauge boson couples predominantly to the dark matter particle (and possibly other particles), but also acts as a portal to the dark sector in these models thanks to a feeble coupling ε to the standard model.
Dark photons A′, massive gauge bosons of a new broken U(1)_{D} interaction are a prominent example for such a new gauge boson. The dark photon can mix kinetically with the standard model photon, enabling the thermal freeze-out of dark matter particles with masses well below the Lee-Weinberg bound.
Dark photons can be produced in a process called dark bremsstrahlung, for example by shooting a beam of electrons onto a thick target. In this contribution we present the proposal for an experiment at the ELSA accelerator in Bonn that will search for the production of dark bremsstrahlung: the Lohengrin experiment.
A beam of 3.2 GeV electrons is directed onto a tungsten target, placed in a strong magnetic field in the center of a tracking detector that is used for triggering and track reconstruction. Signal events are characterized by a low energy electron and a significant amount of missing momentum and energy in the final state. A fast electromagnetic calorimeter is placed behind the tracking volume to efficiently veto events with standard model bremsstrahlung. A hadron veto is used to discard events with electron-nuclear or photon-nuclear interactions producing neutral hadrons. In order to reach the sensitivity to cosmologically relevant regions in the mA′ − ε parameter space, the key properties of the experiment are 1) a high rate of incoming electrons and 2) a highly efficient background rejection at the order of 10^(−12).
We will demonstrate the feasibility of the Lohengrin experiment using next-generation tracking detectors and calorimeters, and will show that the proposed experiment has the potential to conclusively probe the dark photon parameter space for dark photon masses between ~1 MeV and ~50 MeV, an interval that is not currently covered by any existing experiments.

Speaker: Tobias Schiffer (University of Bonn (DE))

14:25 The Search for Low-mass Dark Matter in the Kamioka Cryo Laboratory

Recently, there has been an increasing interest in searching for low-mass dark matter. To address this new direction, a new experimental setup for low-mass dark matter searches has been commissioned at the Kamioka Underground Laboratory. A dilution refrigerator has been installed underground, and gamma and neutron shielding is under construction. Ambient gamma and neutron levels have been measured and a Geant4 simulation model has been constructed to predict experimental background rates with this setup. Multiple experiments are under preparation for g-yr level dark matter searches starting in late 2027, including a test underground run of a superfluid helium payload and superconducting targets with TES sensor readout. In this talk, a status update will be given and future prospects will be briefly discussed.

Speaker: Suerfu Burkhant (The University of Melbourne)

14:40 Quantum geometric phase for new physics detection

Quantum geometric phases convert weak new-physics signals into measurable phases through controlled oscillator trajectories. I will discuss applications to bosonic dark matter and spin-dependent fifth forces. In cavity systems, coherent displacement and squeezing amplify the phase induced by dark photons or axions, enabling sensitivity beyond the standard quantum limit. In trapped ions, a fifth-force gradient interferes with a calibrated reference force to generate a motional geometric phase complementary to Ramsey sensing. These examples establish geometric phase as a versatile tool for enhancing sensitivity and controlling systematics in new-physics searches.

Speaker: Xiaolin Ma (KEK/QUP)

15:00 → 15:20 Tea & Coffee Break

15:20 → 17:00 Monday Afternoon Session: Poster 1 slide Short Talks

15:20 Belle II excess and dark matter semi-annihilation

In 2023, the Belle II Collaboration announced the observation of the
B→K+νν decay channel for the first time. This decay channel provides a clean signal with high precision in theoretical calculations. However, we encounter a 2.8σ deviation from the Standard Model prediction. To resolve this excess, we study a scalar dark matter model with local discrete Z_3 symmetry. Assuming dark U(1)X≡U(1){Lμ-Lτ} symmetry, this U(1){Lμ-Lτ} symmetry is spontaneously broken into local discrete Z_3 by nonzero vacuum expectation value of dark Higgs boson. Considering a dark Higgs mass is 2 GeV, we can explain the recent Br(B→K+νν) excess reported from the Belle II Collaboration and relic abundance at the same time.

Speaker: Dr Jongkuk Kim (Kangwon National University)

15:22 Axion minicluster and minicluster streams within the galaxy.

If dark matter is axions that solve the strong CP problem and the symmetry breaking of the axion field happens after inflation, there exists the possibility that the axions are clumped into asteroid sized objects called miniclusters. But these objects formed in the early universe is likely disrupted by the tidal forces and stellar interaction at late times, causing the local dark matter density fluctuate. Using semi-analytic methods we present a realistic model of the local dark matter density that is directly relevant for direct detection probes of these QCD axions, such as haloscopes.

Speaker: Ananthu Krishnan Anilkumar (University of Sydney)

15:24 ALP Bremsstrahlung in Proton Beam Dumps: Constraints on Electron-Proton Coupling Products

We study axion-like particle (ALP) production via proton bremsstrahlung in proton beam dumps. Using the Weizsäcker-Williams approximation and the ALPINIST framework, we compute ALP production rates and derive constraints on the product of ALP-electron and ALP-proton couplings, $g_eg_p$, via the decay channel $a \rightarrow e^+ e^-$. We further assess the sensitivity of our results to the underlying QCD model by examining the dependence on light quark PQ charges. Our results are then compared to existing constraints from precision spectroscopy experiments, which probe the same coupling product in the low-MeV mass range, thus allowing for a direct comparison between beam dump and precision observables.

Speaker: Cedric Quint (Max Planck Institute for Nuclear Physics)

15:26 Generalization of Glauber's theorem for dark matter axions and graviton detection

We generalize Glauber’s theorem to quantum fields generated by classical sources, including axion dark matter and gravitational waves. In quantum optics, Glauber’s theorem states that a classical current produces quantized photons in a coherent state. Likewise, the linearity of the inverse Primakoff and Gertsenshtein effects leads to coherent photon states in resonant cavities driven by classical dark matter or gravitational-wave fields. We also introduce thermal coherent states as a more realistic description of resonators employed in axion and gravitational-wave detectors. Finally, we derive a general solution for squeezed graviton states produced during black hole mergers.

Speaker: Akira Miyazaki (Université Paris-Saclay (FR))

15:28 Non-mechanically tunable plasma haloscope with superconducting nano-wires

One of the major challenges facing current dark matter haloscopes is frequency tuning in a cryogenic environment. Mechanical tuning becomes increasingly impractical for plasma haloscopes operating above 20 GHz because of the extremely fine structure of the wire arrays. In this work, we propose a novel method for tuning the resonant frequency of plasma haloscopes through the kinetic inductance of superconducting nanowires. A DC current flowing through the wires modifies the Cooper-pair density and thereby shifts the plasma frequency via changes in the kinetic inductance. While this phenomenon is well known from the development of superconducting kinetic inductance detectors (KIDs), we present a new calculation of the quality factor, which is simultaneously affected by the applied current. The DC current broadens the density of states of Bogoliubov quasiparticles, leading to a nontrivial modification of the optical conductivity of the superconductor. A complete calculation of the complex conductivity enables the simultaneous determination of both the resonant frequency and the quality factor of a plasma haloscope.

Speaker: Akira Miyazaki (Université Paris-Saclay (FR))

15:30 The phenomenology of axion relic pockets

Axion relic pockets are phase-transition remnants consisting of regions of false vacuum stabilised from collapse by a hot axion gas. Axion relic pockets can comprise dark matter, but little is known about their phenomenology. We consider trapped axions coupled to electromagnetism and show that axion-photon conversion occurs in atomic electric fields, leading to high-energy electromagnetic cascades that may be detectable by neutrino, cosmic-ray, and dark-matter experiments. Calculating the interaction rate requires accounting for the pocket's compactness and spherical geometry. The distribution of electromagnetic showers is inherently isotropic, and upward-going showers provide a smoking-gun signal for the model. Using recent data from the IceCube neutrino telescope, we derive the first limits on axion relic pockets. We also comment on the prospects for detecting axion relic pockets with atmospheric detectors, including fluorescence detection by the Pierre Auger Observatory and radio Cherenkov detection by balloon-borne payloads, such as ANITA and PUEO. These results open a new observational window on dark matter and motivate dedicated searches for the associated electromagnetic showers across existing and forthcoming high-energy facilities.

Speaker: Charalampos Nikolis

15:32 Current Status of the DOSUE-RR Dish Antenna Search for Wave-like Dark Matter

Our project, DOSUE-RR (Dark-photon dark-matter Observing System for Un-Explored Radio-Range), is one of the experiments searching for dark matter using a dish antenna method. We particularly target the relatively high mass range above 100 $\mu$eV, covering the full millimeter-wave band from roughly 20 GHz to 300 GHz, which corresponds to a mass range of approximately 80 $\mu$eV to 1.2 meV. Given such a wide frequency range, we divide the measurements band by band, modifying our receiver for each band or developing new receivers as needed. I will give an overview of our current activities; while DOSUE-RR mainly focuses on the dark photon dark matter search, these activities include an axion-like particle search using a magnet.

Speaker: Shunsuke Adachi (Okayama University)

15:34 Wave-like Dark Matter Search with Superconducting Qubits in Quantum Computers

Dark matter searches using superconducting qubits have so far been carried out with qubits individually fabricated for quantum-sensing purposes. Extending such searches to a broadband scan over many candidate dark matter masses using multiple qubits, however, requires a large number of high-quality qubits with well-controlled properties. Superconducting quantum computers, in contrast, provide many frequency tunable qubits with long coherence times, making them a promising platform for dark matter searches over a wide mass range.
In this talk, we report results from a dark matter search performed with a single qubit on a superconducting quantum computer, in which the qubit transition frequency is tuned to match the dark matter mass. We further discuss an extension of this technique using multi-qubit entangled states (W states and GHZ states), which can in principle enhance sensitivity beyond the standard quantum limit.

Speaker: Yuya Mino (University of Tokyo)

15:36 Enhanced Axion Fluctuations in the Pre-Inflationary Scenario

In the pre-inflationary scenario, axion dark matter is expected to be highly homogeneous, with perturbations sourced mainly by gravity. We study a recently proposed mechanism in which the axion field couples to the temperature fluctuations in the primordial plasma, analysing its interplay with gravitational perturbations. We show how these plasma-induced fluctuations are transferred to the axion field and follow their evolution, finding significantly larger overdensities than in the standard gravity-induced scenario. We further explore the interplay between this mechanism and large misalignment angles, showing how together they can induce the formation of axion miniclusters and impact the small-scale structure of axion dark matter. These results imply that the local density relevant for direct detection experiments may differ from standard expectations.

Speaker: Yeray Garcia Del Castillo

15:40 New limits on ultralight axion-like dark matter with a pulsar polarisation array

Pulsar polarisation arrays (PPAs) enable searches for oscillations in the polarisation position angle of radio waves induced by axion-like particles. They currently provide some of the strongest constraints on ultralight axion-like dark matter (ALDM) of mass 10^-24 eV < m_a < 10^-20 eV. However, other effects during propagation and reception of the radiation also modify its polarisation, posing challenges in obtaining these limits. We present new methods to account for these effects in data from the Parkes radio telescope and apply them to a PPA featuring observations not previously used for this purpose. With this, we derive competitive new limits on the axion-photon coupling for ultralight ALDM.

Speaker: Jackson Mitchell-Bolton (University of Sydney)

15:42 Search for Hidden Photon Dark Matter Using Direct Excitation of Superconducting Qubits

We present a search for hidden photon dark matter using superconducting qubits, based on the method proposed by our group (Moroi et al., Phys. Rev. Lett. 131, 211001 (2023)). Hidden photon dark matter induces an AC electric field through kinetic mixing with ordinary photons. This electric field can excite a qubit on resonance. Assuming that fake excitations form an approximately frequency-independent background, a narrow dark matter signal can be detected as an excess in the excitation rate by sweeping the frequency of tunable qubits. To determine the excitation rate at each frequency, we repeatedly let the qubit idle for a fixed time and measure its state. In this talk, we report our experimental results to date and discuss ongoing efforts to improve the detector sensitivity based on these results.

Speaker: KARIN WATANABE (The University of Tokyo)

15:44 Development of the optical calibration system for the SABRE South active veto

The SABRE South experiment, located at the Stawell Underground Physics Laboratory (SUPL) in Victoria, Australia, is an ultra-low-background dark matter experiment designed to test the long-standing annual modulation signal reported by DAMA/LIBRA. The detector employs ultra-pure NaI(Tl) crystals surrounded by an active liquid scintillator veto instrumented with 32 photomultiplier tubes (PMTs), providing efficient background rejection and additional information on background-producing particles. Reliable optical calibration of the veto system is essential for monitoring PMT performance, understanding detector response, and ensuring long-term detector stability.

This contribution presents the integrated development of the hardware and software framework for the SABRE South optical calibration system. A dedicated prototype veto vessel at Adelaide University is being used to develop and validate the complete calibration chain prior to deployment in the underground detector. On the hardware side, the work includes the implementation of a diffuse optical calibration source, the optical distribution system, and the associated data acquisition (DAQ) electronics. In parallel, Geant4 simulations together with Python/ROOT analysis tools are being developed to model optical photon transport, PMT response, trigger effects, and the expected calibration data, enabling direct comparison between simulated and measured detector performance.

The combined hardware and software framework will provide a robust approach for in situ calibration and continuous monitoring of the active veto system, supporting detector commissioning and long-term operation. By validating the detector response, assessing optical uniformity, monitoring PMT stability, and reducing instrumental uncertainties, this work will contribute to the low-background performance required for the SABRE South search for an annual modulation signal from dark matter.

Speaker: Dr Irene Bolognino (Adelaide University)

15:46 DOSUE-RR Experiment: The Direct Search for Dark Photon Dark Matter with the Broadband Millimeter-Wave Receiver FINER at $m_{\text{DP}}= 0.89–1.35$ meV

The dark photon is one of the candidates for cold dark matter. It is theoretically motivated by specific models of string theory and inflation models, characterized by a very small mass in the range of$m_{\text{DP}} \approx \mu\text{eV} - \text{meV}$. It interacts with ordinary photons through a kinetic mixing parameter $\chi (\le 10^{-10})$. Driven by this interaction, the dark photon converts into photons with a specific frequency at the surface of a metal interface. Based on energy conservation ($m_{\text{DP}}c^2 = h\nu$ ), the frequency of the converted photon corresponds directly to the mass of the dark photon.

The DOSUE-RR (Dark photon dark matter Observing System for Un-Explored Radio-Range) experiment aims to detect these signals. In this study, we searched for the dark photon in the frequency range of 214–326 GHz, which corresponds to a mass range of 0.89–1.35 meV. The observation was performed over a period of 10 days using the wideband millimeter-wave receiver “FINER” to be installed on the Large Millimeter Telescope (LMT) in Mexico. In this presentation, we will report on the performance of the receiver used in the actual observation and the current status of the data analysis.

Speaker: Shunki Endo (University of Tsukuba)

15:48 3D Nonlinear Cavities Galvanically Integrated with Josephson Junction Devices for Dark Matter Searches

Quantum devices based on Josephson junctions have attracted growing interest for ultra-light dark matter detection. In particular, superconducting qubits can be used as sensitive detectors [1, 2, 3, 4] or frequency tuners [5, 6, 7] in haloscope-like measurements for dark photon and axion searches.
A direct excitation scheme using superconducting qubits [3] can combine high tunability, potentially enabled GHz-scale tuning, with high sensitivity, surpassing existing exclusion limits [8]. However, this approach suffers from a limited effective volume, because superconducting qubits used as dipole antennas are effectively much smaller than resonant cavities.
Here, we propose 3D nonlinear cavities with galvanically integrated Josephson junction devices. Through the galvanic connection between Josephson junctions and cavities, the cavity acquires nonlinearity and can be operated as a qubit-like detector with a large effective volume.
In this presentation, we will report the concept of this study, simulation results, and the progress toward experimental demonstration.

Citation:
[1] Dixit et al., PRL 126, 141302
[2] C. Braggio et al., PRX 15, 021031
[3] S. Chen et al., PRL 131, 211001
[4] P. Zheng et al., PRL 136, 171002
[5] F. Zhao et al., PRL 135, 201002
[6] K. Nakazono et al., Patras 19th (Oral session)
[7] K. Nakazono et al., arXiv: 2505.15619
[8] K. Watanabe et al., Patras 20th (Poster session)

Speaker: Kan Nakazono (the University of Tokyo)

15:50 CYGNUS-Oz: Directional Gas TPCs for Next-Generation Rare-Event Searches

The CYGNUS-OZ collaboration is pursuing the development of gaseous Time Projection Chambers (TPCs) for next-generation rare-event particle physics experiments that make use of the directional measurements achievable with these detectors. Directional detectors offer a powerful handle for distinguishing a genuine signals of interest from backgrounds. The quintessential use-case of directional detection is for WIMP dark matter searches, where the angular distribution of recoils arising from signal dark matter events is readily separable from solar neutrino backgrounds. The CYGNUS Consortium is an international R&D collaboration which aims to develop directional gas TPCs for rare event searches, with CYGNUS-Oz the Australian grouping. This contribution outline the CYGNUS-Oz experimental activities and roadmap, including our existing TPC prototypes CYGNUS-1 and CYGNUS-N, and our large-scale prototype CYGNET. It will also present detector simulation and machine-learning reconstruction studies focused on improving three-dimensional track directionality, across candidate gas mixtures and readout configurations. These results demonstrate the improvements achievable with modern transformer-based machine-learning methods and discussion will be made on how this translates to improved sensitivity for dark matter searches.

Speaker: Daniel Avraham

15:52 Prototype Fabry-Perot polarimeter for vacuum magnetic birefringence using high frequency magnetically levitated rotating magnets

Vacuum magnetic birefringence is a QED prediction in which a magnetic field makes the vacuum optically anisotropic. The expected birefringence is extremely small, approximately $4 \times 10^{-24} ~[\mathrm{T}^{-2}] \cdot B^2$, and has not yet been directly measured. A major limitation of cavity enhanced polarimetry is intrinsic birefringence noise, likely dominated by thermal fluctuations in the cavity mirror coatings, which decreases with increasing signal frequency. We present a prototype Fabry-Perot polarimeter utilizing magnetically levitated dipole magnets rotating at high frequency in vacuum. An active magnetic bearing concept aims to suppress mechanical vibration while allowing rotation frequencies up to $500 ~\mathrm{Hz}$, with the vacuum magnetic birefringence signal appearing at twice the rotation frequency. This approach shifts the measurement to a lower noise spectral region and provides a path toward improved sensitivity in laboratory searches for vacuum magnetic birefringence.

Speaker: Mr Ryan Netrval (Max Planck Institute for Gravitational Physics)

15:54 Superconducting Thin Film Development for RF Cavities in Axion Dark Matter Searches

Superconducting RF cavities operating in magnetic fields are a promising technology for next generation axion dark matter searches, where ultra high quality factors are required to maximise detection sensitivity. Achieving these performance levels requires low loss superconducting surface coatings that retain their properties under strong magnetic fields and cryogenic conditions. A key challenge is the development of reliable fabrication routes and a consistent evaluation framework for superconducting coatings across multiple material platforms.
This work develops and compares multiple thin film deposition approaches for superconducting cavity applications. Pulsed DC reactive magnetron sputtered NbTiN thin films are used as a mature experimental platform, while REBCO based thin films are pursued in parallel as a higher performance candidate system.
NbTiN is deposited using pulsed DC reactive magnetron sputtering, while REBCO is fabricated using a combination of RF and DC magnetron sputtering. The sputtering parameter space is systematically explored to identify stable deposition windows, with emphasis on optimising deposition conditions to improve film quality and superconducting performance.
A multi modal characterisation strategy is employed, combining X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM), optical profilometry, and four point probe measurements. Together, these techniques establish a framework linking deposition conditions to structural, compositional, electrical, and morphological properties, enabling systematic process optimisation.
Final evaluation is performed through cryogenic measurements in a dilution refrigerator. Superconducting behaviour is confirmed around 5 K for NbTiN, with high magnetic field measurements to be completed prior to presentation.
Overall, this work establishes a fabrication and evaluation methodology for superconducting coatings intended for RF cavities operating in strong magnetic fields. By developing scalable deposition processes across both NbTiN thin films and REBCO based coated conductor systems, this work supports the advancement of low loss superconducting cavity technologies for future axion dark matter detection experiments.

Speaker: Ethan Han (Swinburne University of Technology)

15:56 Minimal F-DFSZ Axion Models: Predictive Yukawa Textures and Flavour Constraints

Invisible axion models are well motivated solutions to the strong CP problem, yet they typically contain a largely unconstrained flavour sector. I will present a predictive class of Minimal Flavoured DFSZ models in which the Peccei–Quinn symmetry simultaneously explains the observed pattern of quark masses and mixing while possessing a domain wall number of unity. The flavour structure is sufficiently constrained that all Yukawa couplings can be reconstructed from measured quark masses and CKM observables, leading to analytic predictions for flavour-violating Higgs and axion interactions. I will present the resulting phenomenology and demonstrate how current precision flavour measurements translate into robust constraints on the axion decay constant and the underlying scale of new physics. This framework provides a concrete example of how flavour physics can substantially enhance the discovery potential for invisible axions beyond traditional astrophysical and cosmological probes.

Speaker: Maaz Hayat (University of Melbourne)

15:58 Impurity-Induced Ferroelectric Behaviour in KTaO₃: Implications for Cryogenic Microwave Resonators in Wave-Like Dark Matter Searches

High-quality microwave resonators are a key enabling technology for axion haloscopes and other wave-like dark matter experiments, where detector sensitivity depends critically on the stability and microwave loss of dielectric materials at cryogenic temperatures. Potassium tantalate (KTaO₃) is a promising quantum paraelectric dielectric owing to its high relative permittivity and intrinsically low microwave loss. We present cryogenic microwave dielectric spectroscopy measurements of a nominally pure KTaO₃ single crystal that reveal an unexpected paraelectric-to-ferroelectric phase transition at approximately 134 K. Measurements of multiple resonant modes show a pronounced anomaly in the temperature dependence of the dielectric response, including a reversal in the resonance frequency shift below the transition temperature. To determine the origin of this behaviour, laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) was performed, revealing a significantly higher residual niobium concentration than in crystals exhibiting the expected quantum paraelectric behaviour. These results indicate that unintentional Nb incorporation effectively forms KTa₁₋ₓNbₓO₃ (KTN), driving the observed ferroelectric transition. The study demonstrates that trace impurity levels can substantially modify the microwave properties of dielectric resonator materials and highlights the importance of rigorous materials characterisation for precision cryogenic experiments. These findings provide practical guidance for the selection, qualification, and modelling of dielectric materials used in high-Q tunable microwave resonators for future axion and other wave-like dark matter searches.

Speaker: Cindy Zhao (Quantum Technologies and Dark Matter Labs, Department of Physics, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.)

16:02 Improved Axion Flux from Axion-Electron Interactions in the Sun

We calculate the axion flux from the Sun due to axion-electron interactions by fully accounting for electron transitions between different bound states. For multiple elements, we consider a wide range of ionization and excitation states and compute the axion-induced transitions between them.\
The axion flux from axion-electron interactions is usually estimated via an approximate relation to the photon flux. However, this approach neglects magnetic-like transitions ($\Delta L=0$), which are of the same order as electric-like transitions ($\Delta L=\pm1$) for axion-induced processes.\
In this work, we instead apply tools from condensed matter physics, treating the problem as a generalized Anderson impurity model, in which the interactions are described through the self-energy or hybridization function. For photon-electron transitions, this method allows us to calculate energy shifts in atomic multiplets, such as the Lamb shift, as well as transition spectra for fluorescence or Auger-Meitner decays. A similar approach can then be applied to axion-electron interactions.

Speaker: Vera Butz (University of Heidelberg)

16:04 Super conducting circuits for future dark matter searches

Recent experiments have suggested future particle dark matter searches can be improved and even performed entirely with superconducting circuits [1]. However, superconducting qubits are highly susceptible to quasiparticle generation from background ionizing radiation, which produces energetic phonons capable of breaking Cooper pairs and inducing correlated errors. Following the observation of cosmic-ray–induced error bursts in large-scale superconducting qubit arrays [2], recent efforts have explored reducing the impact of ionizing radiation through gap engineering ,phonon downconversion, material optimization, and underground operation [3,4,5]. However, scalable on-chip suppression of phonon-mediated quasiparticles remains an open challenge.

In this work, we present the design and fabrication of transmon qubits on a silicon-on-insulator (SOI) platform incorporating suspended membranes that act as acoustic low-pass filters. This architecture enables systematic investigation of phonon transport and its role in radiation-induced decoherence. We report successful fabrication and characterization of SOI-based transmons with parity-switching rate approaching 0.1 Hz. These results demonstrate the compatibility of membrane-supported architectures with standard superconducting qubit fabrication processes. The proposed architecture can be implemented alongside other mitigation strategies to further reduce the impact of ionizing radiation, thus reducing potential background signals in future dark matter experiments.

[1]: Dixit, A., Chakram, S., He, K., Agrawal, A., Naik, R., Schuster, D., & Chou, A. (2021). Searching for Dark Matter with a Superconducting Qubit. Phys. Rev. Lett., 126, 141302.

[2]: McEwen, M., Faoro, L., Arya, K. et al. Resolving catastrophic error bursts from cosmic rays in large arrays of superconducting qubits. Nat. Phys. 18, 107–111 (2022).
[3]: T. Yamamoto, Y. Nakamura, Yu. A. Pashkin, O. Astafiev, and J. S. Tsai, "Parity effect in superconducting aluminum single electron transistors with spatial gap profile controlled by film thickness," Appl. Phys. Lett. 88, 212509 (2006).
[4]: Loer, B., et al. Abatement of ionizing radiation for superconducting quantum devices. Nat. Commun. 15, (2024).
[5]: Bargerbos, A., et al. Mitigation of quasiparticle loss in superconducting qubits by phonon scattering. Phys. Rev. Lett. 131, (2023).

Speaker: William Campbell (The University of Queensland)

16:06 Characterization of Dielectrics for the DPHaSE Disordered Haloscope

DPHaSE (Dielectric Powder Haloscope SNSPD Experiment) is a broadband axion and dark photon search targeting QCD axion-photon couplings in the 10 meV-eV mass range. The haloscope makes use of dark matter to photon conversion on the surface of disordered dielectric powder, with conversion rate proportional to surface area. To achieve sensitivity in this mass range, our dielectric haloscope maximizes surface area using micron-sized particles in a disordered dielectric target coupled to a Superconducting Nanowire Single Photon Detector (SNSPD). I will present recent work on the design of the disordered dielectric target, characterization of dielectric powders, and the veto system.

Speaker: Madeleine Carhart (University of Washington)

16:08 Inverse Design of Electromagnetic Cavities for Axion Searches

Ultralight axion dark matter may couple to electromagnetic fields through the interaction term $g_{a\gamma\gamma}a\,\mu_0\mathbf{E}\!\cdot\!\mathbf{H}$ [1-4]. Traditional cavity haloscopes exploit this coupling using a strong external DC magnetic field [5,6], whereas upconversion experiments use the spatial overlap between resonant electromagnetic modes to probe axion frequencies below the cavity resonance [7-13].

In conventional two-mode schemes, however, practical limits on the minimum mode separation restrict sensitivity to the lowest axion masses [8]. Twisted anyon cavity resonators offer a single-mode alternative by supporting helical eigenmodes with nonzero electromagnetic helicity in free space, allowing the axion field to couple directly to a single resonant mode without an applied DC magnetic field [14]. This approach enables sensitivity to ultralight axions over the mass range $10^{-18}$-$10^{-13.7}\,\mathrm{eV}$. However, because the helicity of these modes depends sensitively on the full three-dimensional cavity boundary, high-performance geometries are difficult to identify using conventional heuristic design methods [15].

We present an inverse-design framework for optimising three-dimensional microwave cavities for single-mode ultralight axion searches. Parameterised cavity geometries are evaluated using finite-element eigenmode simulations and explored using a genetic algorithm [15]. The optimisation employs a composite figure of merit containing the cavity-dependent contribution to the expected axion-induced amplitude-modulation index, which quantifies the strength of the axion-induced amplitude modulation of the resonant cavity field,
\begin{equation}
F(\mathbf{x})=
\frac{\hat{Q}0^{\mathrm{opt}}
\left|\mathscr{H}{\mathrm{opt}}\right|}
{f_{\mathrm{opt}}}.
\end{equation}
Here, $\mathscr{H}_{\mathrm{opt}}$, $f_{\mathrm{opt}}$, and $\hat{Q}_0^{\mathrm{opt}}$ are the helicity, resonant frequency, and estimated intrinsic quality factor of the optimal cavity mode. Maximising this quantity increases the expected signal-to-noise ratio within the resonator bandwidth and reduces the measurement time required to reach a fixed axion sensitivity.

The framework is applied to cavity families compatible with additive and subtractive manufacturing in superconducting niobium, incorporating dimensional and fabrication constraints relevant to operation in a dilution refrigerator. Although additively manufactured geometries provide greater freedom to maximise helicity, the optimised subtractively manufactured design achieves the highest predicted performance because of the substantially lower surface resistance achievable in high-purity bulk niobium [16,17]. Compared with the original heuristically designed twisted anyon cavity haloscope [14], the optimised design improves the figure of merit by more than three orders of magnitude. This leads to a projected axion--photon coupling sensitivity of $g_{a\gamma\gamma}<10^{-11}\,\mathrm{GeV}^{-1}$ for an acquisition time of three months. These results demonstrate how inverse design can systematically identify fabrication-compatible, high-$Q$, helical microwave cavities for future ultralight axion searches.

REFERENCES:
[1] R. D. Peccei and H. R. Quinn, Phys. Rev. Lett. 38, 1440 (1977).
[2] S. Weinberg, Phys. Rev. Lett. 40, 223 (1978).
[3] F. Wilczek, Phys. Rev. Lett. 40, 279 (1978).
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[5] P. Sikivie, arXiv:1009.0762 (2013).
[6] B. T. McAllister, et al., Phys. Rev. Lett. 116, 161804 (2016).
[7] M. Goryachev, et al., Phys. Dark Universe 26, 100345 (2019).
[8] C. Thomson, et al., Phys. Dark Universe 32, 100787 (2021).
[9] R. Lasenby, Phys. Rev. D 102, 015008 (2020).
[10] R. Lasenby, Phys. Rev. D 103, 075007 (2021).
[11] A. Berlin et al., J. High Energy Phys. 07, 001 (2020).
[12] C. A. Thomson et al., Phys. Rev. Lett. 126, 081803 (2021); 127, 019901(E) (2021).
[13] C. A. Thomson et al., Phys. Rev. D 107, 112003 (2023).
[14] J. F. Bourhill, et al., Phys. Rev. D 108, 052014 (2023).
[15] E. Paterson, et al., arXiv:2602.09037 (2026).
[16] P. Frigola et al., in Proc. SRF2015, THPB042 (2015).
[17] S. Posen et al., Phys. Rev. Applied 13, 014024 (2020).

Speaker: Emma Paterson (University of Western Australia - QDM Labs)

16:10 The Twisted "Anyon" Cavity Readout: Measurement System for Ultralight Dark Matter Detection

We describe the readout system electronics used for detection of amplitude modulation sidebands induced by ultralight axions in a twisted anyon cavity. A twisted cavity with asymmetrical boundary conditions proposed in (Bourhill et al. 2023) was shown to generate helical radiation in a single eigenmode. That is, a single mode has a non-zero $\vec{E}\cdot \vec{B}$ product, hence can act as both the background and readout mode for interaction with axion dark matter. The authors showed that such a cavity driven with a sinusoidal microwave pump field experiences amplitude modulation sidebands due to upconversion of ultralight axions.

In this work, we design an interferometric readout system capable of turning this small amplitude modulation into a detectable output voltage. Taking into account both electronics noise contributions and existing pump amplitude noise we derive the signal-to-noise ratio (SNR) of a realistic experiment. We describe how this system design maximises sensitivity to the axion signal while minimising sensitivity to background noise. Finally we see, that using readily available electronics, an experiment with a high quality twisted anyon cavity may soon result in the most sensitive direct detection experiment for ultralight axion dark matter to date.

Speaker: Robert Crew (University of Western Australia - QDM Lab)

16:12 A DC-Tuned Rectangular Cavity for the ORGAN 2a Axion Dark Matter Search

The ORGAN experiment seeks to detect axion dark matter through its resonant conversion to microwave photons inside a strong magnetic field. With the ORGAN 1b run complete, attention turns to ORGAN 2a, which will probe the previously unexplored 15.96–16.15 GHz band, corresponding to axion masses of 66.0–66.8 μeV. Here we describe the design, optimisation, and performance of the rectangular resonant cavity developed for this search.
We adopt a DC tuning mechanism in which piezoelectric actuators translate one cavity wall, shifting the resonant frequency without additional structures inside the cavity. Operating the piezoelectric actuators under a static DC voltage, rather than as stick-slip positioners, avoids the heat dissipation and mechanical vibration associated with slip events, both significant concerns at cryogenic temperatures. Unlike conventional approaches based on rotating rods or movable dielectrics, mechanical complexity is avoided and the interior remains unobstructed, maintaining a form factor of approximately 0.657 for a non-tilted wall.
The cavity dimensions were optimised analytically to maximise both geometry factor and volume, and hence the scan rate, under the requirement that mode crossings lie outside the target frequency band, preserving mode purity across the full tuning range. Positioning the wall with a single actuator inevitably introduces tilt, owing to assembly tolerances and alignment; we characterise this via the resulting mode separation and correct it with a dual-actuator configuration under PID feedback that restores the wall to its zero-tilt position.
Finally, we report the mechanical and cryogenic performance of the piezoelectric tuning system, along with pre-search measurements that demonstrate the viability of this approach for the ORGAN 2a campaign.

Speaker: Paige Taylor (Swinburne University of Technology)

16:14 Magnetically Transduced Gravitational wave Inertial detector (MAGI) for the Search for High Frequency Gravitational Waves and Axions

The Magnetically Transduced Gravitational-Wave Inertial Detector (MAGI) is a broadband experiment that uses a large static magnetic-field gradient generated within a superconducting magnet. The inertial pickup element operates in the free-mass regime [1], and its motion is measured inductively using a superconducting pickup loop coupled to either a superconducting quantum interference device (SQUID) or a travelling-wave parametric amplifier (TWPA). MAGI is designed to search for both high-frequency gravitational waves and axion dark matter over an approximate frequency range of $1$-$500~\mathrm{MHz}$. The detector may be configured for these complementary searches by positioning the pickup coil either in the region of maximum magnetic-field gradient, which optimises its response to gravitational-wave-induced inertial motion, or in position of maximum magnetic-field, which is favourable for detecting axion-induced electromagnetic signals. The detector sensitivity depends on the pickup-loop area and geometry, magnetic-field gradient, transformer coupling, SQUID or TWPA noise, mechanical back-action, fabrication imperfections, and thermal and suspension noise. For a magnetic-field gradient of $\partial B/\partial z=1~\mathrm{T\,cm^{-1}}$, a pickup-coil radius of $3~\mathrm{cm}$, a SQUID inductance of $1~\mathrm{nH}$, a mutual inductance of $10~\mathrm{nH}$, and an inertial pickup-coil mass of $1~\mathrm{g}$, the estimated standard quantum-limited strain sensitivity is approximately $\sqrt{S_h^{\mathrm{SQL}}}=10^{-21}/\sqrt{\mathrm{Hz}}$. With currently available SQUID-based readout, the projected strain sensitivity is approximately $\sqrt{S_h}=10^{-19}/\sqrt{\mathrm{Hz}}$ at millikelvin temperatures. For axion dark-matter searches, MAGI targets masses near $0.1~\mu\mathrm{eV}$, with the full frequency range corresponding approximately to axion masses from $4~\mathrm{neV}$ to $2~\mu\mathrm{eV}$. The long-term objective is to reach an axion-photon coupling sensitivity of order $g_{a\gamma\gamma}\sim10^{-18}$-$10^{-19}~\mathrm{GeV}^{-1}$, comparable to the sensitivity targeted by broadband experiments such as DMRadio and SLIC [2-4].

[1] V. Domcke, S. A. Ellis, and N. L. Rodd, Physical Review Letters 134, 231401 (2025).

[2] N. Crisosto, P. Sikivie, N. Sullivan, D. Tanner, J. Yang, and G. Rybka, Physical Review Letters 124, 241101 (2020).

[3] B. T. McAllister, A. Quiskamp, C. A. O’Hare, P. Altin, E. N. Ivanov, M. Goryachev, and M. E. Tobar, Annalender Physik 536, 2200622 (2024).

[4] V. Ankel, C. Bartram, J. Begin, C. Bell, S. Chaudhuri, H.M. Cho, J. Corbin, W. Craddock, S. Cuadra, A. Droster, et al., arXiv preprint arXiv:2604.16602 (2026).

Speaker: Sonali Parashar

16:16 Effective-Current Formulation Of Axion-Induced Electric and Magnetic Dipole Moments

We utilise an effective-current framework for electromagnetic dipole generation to recover the axion-induced oscillating electric dipole moment of a static magnetic dipole $\vec{d}_a(t) = -\frac{g_{a\gamma\gamma} a(t)}{c} \vec{m}$. We extend this approach to more general axion-electromagnetic couplings, yielding oscillating electric and magnetic dipole moments $\vec{d}_a(t) = g_{aEM}a(t) \vec{d} - \frac{g_{a\gamma\gamma} a(t) }{c} \vec{m}$ and $\vec{m}_a(t) = g_{aEM} a(t) \vec{m} - c g_{aMM}a(t) \vec{d}$, respectively. These dipole moments and their associated near fields are not suppressed by the axion mass, whereas far-field effects, such as emitted radiation, are suppressed.

Speaker: Jonathan Charlesworth (UWA)

16:18 High-Resolution Axion Search with ORGAN-Q and Thin-Film Coupling for Multi-Resonator Haloscopes

The ORGAN-Q experiment is a dark matter microwave haloscope operated at millikelvin temperatures, featuring a Josephson parametric amplifier. Two simultaneous data streams were recorded during a search for axion dark matter between 6.15--6.35 GHz (25.45--26.27 $\mu$eV). The standard halo model axion search yielded the leading axion--photon exclusion limits across this interval. We report the analysis of the additional sub-hertz resolution stream intended to resolve exceptionally narrow signals, extending the ORGAN-Q search to cold, low-dispersion axion flows. The analysis combines noise-statistics quality control and background removal with time-dependent Doppler tracking and persistence-based candidate selection.

At higher axion masses, challenges of decreased sensitivity arise due to smaller resonator volumes. We investigate combining multiple small resonant volumes without relying solely on aperture coupling. Thin conducting films offer a possible distributed coupling interface between adjacent cavities. Initially developed for a three-resonator system intended for different tests of fundamental physics, a mutual resistance term models the observed coupling behaviour. We use this experimentally grounded framework to investigate constructive operating conditions and shared-readout configurations for multi-cavity axion haloscopes. This work connects the near-term interpretation of ORGAN-Q high-resolution data with a potential route for scaling future high-mass axion detectors.

Speaker: Mr Michael Hatzon (University of Western Australia)

16:20 Muping Chen

We propose the use of sphere-and-plate Casimir force measurement setups to detect ultralight vector dark matter. We demonstrate that sub-picometer signals can be parametrically amplified to be detectable. We present a novel improvement that allows the continuous tuning of the natural frequency of the system, opening new research opportunities at the submicron scale. We show that the improved setup can determine the dark matter mass with high accuracy, significantly expand the detectable mass range, and achieve the best sensitivity to date in the $2\times10^{-13}{\rm~ eV}\sim3\times10^{-11}{\rm~ eV}$ mass range.

Speaker: Muping Chen

16:22 Frequency Edge Sensing for Cryogenic Bolometry

We studied the feasibility of implementing cryogenic bolometry for rare-event searches with the temperature-sensitive, high-Q whispering gallery mode in a sample of single-crystal calcium tungstate (CaWO$_4$) and present conservative estimates of the minimum energy threshold on the order of MeV.

Solid-state detectors for rare-event searches typically utilise a crystalline target coupled to high-sensitivity thermal transducers. Light dark matter (LDM) is hypothesised to undergo elastic scattering with target nuclei or electrons, necessitating detectors capable of resolving $\mu$K temperature fluctuations. Dual-channel detection is standard practice for signal discrimination, pairing bolometry with either scintillation or ionisation (charge) channels to differentiate between electron and nuclear recoils. This investigation focused on advancing the thermometry limit of established cryogenic bolometers. Transition Edge Sensor (TES) bolometers, amongst other LDM detectors, are currently limited by low-energy excess (LEE) noise. While the origin of LEE remains speculative, it is frequently attributed to dark currents, shot noise, lattice strain, and Kapitza resistance at the sensor-target interface. It is hypothesized that these noise sources are exacerbated by the external nature of the sensors and attempts to alleviate mounting strain have been pursued.

We propose utilising the target crystal itself as the transducer; coupling high-Q WGM resonances with zero-field spin transitions to circumvent interface-related noise and strain-induced artifacts. Spin-photon coupling induces frequency detuning (∆f). This non-linear interaction provides a temperature coefficient (α) of the dielectric permittivity ($ϵ_{r}$). The mechanism is driven by dilute spin ensembles originating from paramagnetic impurities or intrinsic colour centers within the CaWO$_{4}$ matrix at zero magnetic field (ZF). The method presented establishes a promising way forward for conducting cryogenic bolometry that will complement mature TES-based cryogenic bolometers, potentially ruling out LEE noise.

Speaker: Elrina Hartman (University of Western Australia)

16:24 A Novel Qubit Sensor Fabrication Technique Toward High Frequency Direct Excitation Dark Photon Searches

Qubit-based readout technologies enable a SQL-free sensitivity in dark matter haloscope experiments, particularly in the high frequency regime (>5GHz). We are developing high frequency superconducting qubit detectors for direct excitation dark-photon searches above 20 GHz, where suitable devices have not yet been established. Toward this goal, we introduced a “double-oblique evaporation” technique for qubit Josephson junction fabrication, enabling a simpler and more reproducible process without electron-beam lithography [1]. Room-temperature resistance measurements of test junctions confirmed successful junction formation with a high fabrication yield, demonstrating the reproducibility of the process. A transmon qubit fabricated with this technique was characterized in a three-dimensional microwave cavity at 20 mK and showed a relaxation time of 9.2 μs. This result provides a basis for extending the device frequency toward the >20 GHz regime required for direct dark photon searches. In this talk, we also report the status of the search experiment incorporating this sensing technique.

[1] K. Aoyanagi et al., arXiv:2605.19590v1

Speaker: Koki Aoyanagi (Kyoto University)

16:26 AICE in the hole: atom interferometry in an LHC access shaft as an ultralight dark matter facility

Atom interferometers are highly-versatile quantum sensors with applications ranging from geodesy and inertial navigation to fundamental physics studies. Differential measurements between two or more atom interferometers operated using a common laser beam offer the prospect for mid-frequency gravitational wave detection and a wide range of ultralight dark matter studies [1]. The sensitivity of such detectors scales with the length of the baseline between the interferometers, and a number of large-scale instruments are in various stages of development, including the AION project in the UK, MAGIS-100 in the USA, ZAIGA in China, MIGA in France, and VLBAI in Germany. These global efforts have also been consolidated under the umbrella of the Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) proto-collaboration [2], which is endorsing the Atom Interferometer CERN Experiment (AICE) [3] proposal for installation of an O(100m) vertical atom interferometer in the PX46 access shaft to the LHC. AICE is intended as a facility with its main scientific objective being the search for ultralight dark matter in scalar, vector B-L, and pseudoscalar axion-like particle (ALP) channels.

[1] C. Baynham et al., Nature 654, 622–628 (2026). DOI:10.1038/s41586-026-10617-1
[2] https://tvlbai.org/
[3] C. Baynham et al., arXiv:2509.11867 [hep-ex]

Speaker: Jesse Schelfhout (University of Oxford)

16:28 Development and Initial Characterization of a Transmon-Based Single Microwave Photon Detector for Axion Dark Matter Searches

Axions are well-motivated dark matter candidates that can be converted into extremely weak microwave photons in a strong magnetic field. At frequencies above a few gigahertz, axion searches relying on phase-preserving linear amplification are increasingly limited by the standard quantum limit, motivating the development of photon-counting receivers. Transmon-based single microwave photon detectors (SMPDs) can map an itinerant microwave photon onto a qubit excitation through a pump-activated four-wave-mixing process combined with engineered dissipation [1,2]. This approach has recently been implemented in an axion haloscope, demonstrating an approximately 20-fold enhancement in search speed compared with quantum-limited linear-amplifier-based detection[3].
We are developing a transmon-based SMPD optimized for axion dark matter searches. As a first step, we improved the fabrication process for superconducting transmon circuits and achieved qubit energy-relaxation times of several tens of microseconds with high yield. Using this improved fabrication process, we produced a prototype SMPD and performed initial cryogenic characterization, including the resonator and qubit parameters, coherence times, and progress toward the activation and calibration of the photon-to-qubit conversion process. These results establish the key device platform for a low-noise photon-counting receiver and guide further optimization of the detection efficiency, bandwidth, and dark-count rate for future axion searches.

reference
[1] Lescanne et al., PRX 10, 021038 (2020).
[2] Balembois et al., PRAppl. 21, 014043 (2024). [3] Braggio et al., PRX 15, 021031 (2025).

Speaker: Chikara Kawai (The University of Tokyo)

16:30 A Novel High Frequency Gravitational Wave Search Using Superconducting Coplanar Waveguide Resonators

We propose a novel high frequency gravitational wave search using superconducting coplanar waveguide resonators, targeting the kHz-MHz band motivated by several theoretical predictions such as primordial gravitational waves and gravitational waves produced by the superradiance of coherent bosonic fields around black holes.
The signature is periodic shifts in the resonator frequency caused by the gravitational wave through elastic strain modes of the chip, detected as phase modulation of the transmitted microwave tone. The projected strain sensitivity of a single CPW resonator is approximately 10^{-12}. A key advantage of this approach is its scalability and capability for broadband searches of stochastic, continuous, and burst gravitational wave signals.
In this talk, the detection principle and the ongoing R&D of the very first prototype are reported.

Speaker: Kosuke Nakamura (Kyoto University)

16:32 Effects of Cosmic-Ray Muons on µeV-to-meV Scale Axion Dark Matter Searches

We estimate the synchrotron radiation emitted by cosmic-ray muons in a uniform magnetic field, focusing on the photon radiation from µeV to meV. Such events can potentially bring backgrounds to the axion dark matter searches. The GEANT4 software package is utilized to simulate the muon tracks in a cylindrical region of interest with an 8 T solenoid magnetic field applied. We further develop an analytical estimation of the angular-frequency-differential synchrotron radiation power spectra in this work as the cosmic-ray muons span a wide range of Lorentz factor γ and pitch angle α. We verify that the cosmic-ray muons are not the dominant noise background for the current axion dark matter experiments on the µeV scale because of the high quality factor Q and fine energy resolution in the readout. However, without sufficient energy resolution in the detector readout, future broadband axion dark matter experiments will be vulnerable to the synchrotron radiation of these charged particles.

Speaker: Dan Zhang (University of Washington)

16:34 Interferometric detection of vacuum nonlinearities without external fields

The interaction of light with light due to zero-point fluctuations of the matter vacuum is a century-old prediction of quantum field theory that has yet to be verified experimentally. This effect can be interpreted as the matter vacuum acquiring nonlinear properties akin to a dielectric medium. Experimental detection of this effect could enable properties of certain beyond-Standard-Model quantum fields to be probed via their virtual contributions to photon-photon scattering, e.g. axion-like particles, millicharged fermions, and quantized gravitons [1].

In this presentation, we outline an all-optical pathway to resolving vacuum nonlinearities using standing-wave laser interferometers which does not require external magnetic fields and use conventional laser sources [2]. We show that the interferometric detection of photon-photon forward scattering predicted by quantum electrodynamics is within reach of laboratory-scale experiments with a sensitivity that improves nonlinearly with the circulating power within the cavity. We outline how such an experiment could be adapted to probe properties of quantum fields beyond the Standard Model of particle physics.

References

[1] Z. Mehdi, J. J. Hope, S. A. Haine, “Signatures of Quantum Gravity in the Gravitational Self-Interaction of Photons,” Physical Review Letters 130, 240203 (2023).

[2] Z. Mehdi, J. J. Hope, S. A. Haine, “Quantum Vacuum Nonlinearities in Laser Interferometers,” arXiv preprint 2609.03314 (2026).

Speaker: Zain Mehdi

16:36 The Multi-mode Acoustic Gravitational-wave Experiment (MAGE)

We operate two cryogenic quartz bulk-acoustic-wave (BAW) strain antennas of the Multi-mode Acoustic Gravitational-wave Experiment (MAGE) simultaneously in a single dilution refrigerator, one at millikelvin temperatures and the other at 1 K. Each is read by an independent SQUID amplifier chain, and both are digitised by a common radio-frequency system-on-chip (RFSoC) lock-in providing 64 simultaneous demodulation channels per chain.

Acquisition is disciplined by a GPS-referenced 10 MHz standard and a 1 PPS signal, giving absolute UTC timing. Over six weeks of operation, we resolve 54 acoustic modes on the 1 K antenna and 14 at millikelvin, spanning 4.99–15.73 MHz. Both antennas are searched for transient energy deposits using a matched filter templated on the free ring-down of each mode. This work is in preparation for GravNet, a global detector network to search for high-frequency gravitational waves. To that end, we are coordinating with the BAUSCIA experiment in Milan, operating near-identical crystals simultaneously and monitoring the same acoustic modes, with the aim of extending this two-detector coincidence to an intercontinental baseline.

The detector is also sensitive to various forms of dark matter that cause oscillations in fundamental constants, which is a line of future research.

Speaker: Aaron Quiskamp` (UWA)

16:56 Hunting for Axions and Hidden Photons in the Wilderness: The Search for Non-Interacting Particles Experimental Hunt (SNIPE Hunt)

The Earth-ionosphere environment can act as a transducer that transforms ultralight bosonic dark matter (axions and hidden photons) into an oscillating magnetic field with a specific pattern across the Earth's surface. We present results of the Search for Non-Interacting Particles Experimental Hunt (SNIPE Hunt), which attempts to detect such dark matter-induced magnetic field patterns by making correlated measurements using a network of magnetometers placed in relatively quiet magnetic environments (remote areas far from human-generated magnetic interference). Our experiment limits the parameter space describing hidden-photon and axion dark matter with Compton frequencies in the 0.5–5.0 Hz range. The next generation of the SNIPE Hunt targets higher frequencies (in the 5 Hz to 1 kHz range) and employs induction-coil magnetometers. In order to clearly interpret the data in terms of dark matter-induced signals without detailed modeling of complicated features of the Earth's ionosphere, we plan to measure the curl of the magnetic field at each site.

Speaker: Ophir Ruimi

16:58 WIMP Meets ALP: Coherent Freeze-Out of Dark Matter

The microscopic nature of dark matter is the major open question in science. Weakly-Interacting Massive Particles (WIMPs) and Axion-Like Particles (ALPs) are the two most theoretically motivated dark matter candidates. Thousands of papers consider them separately. We point out that if both species are present in the theory, even a tiny (Planck-suppressed) interaction between them could lead to drastic modifications of their dynamics in the early universe.

Specifically, we consider the cosmological history of a fermionic WIMP coupled to a light ALP via a quadratic coupling. Although the coupling is too feeble to thermalize the ALP, coherent forward scattering between the two sectors induces temperature-dependent mass shifts that substantially modify both WIMP freeze-out and ALP misalignment dynamics, giving rise to a novel coherent freeze-out mechanism. At high temperatures, the WIMP thermal bath spontaneously breaks the symmetry of the ALP potential, displacing the field to a new vacuum. The resulting back-reaction reduces the WIMP effective mass and significantly delays its freeze-out. Depending on the strength of the coupling, symmetry restoration occurs via either a first-order phase transition (FOPT) or a crossover. In the FOPT regime, dark matter consists solely of WIMPs, whose delayed freeze-out permits annihilation cross sections up to three orders of magnitude above the standard value, while still yielding the correct relic density. In the crossover regime, both WIMP and ALP can contribute to dark matter. Remarkably, we find an "ALP miracle": a Planck-suppressed quadratic coupling yields an ALP abundance comparable to the observed dark matter density, largely independent of its initial displacement and mass.

Speaker: Bingrong Yu (Cornell University)

17:00 → 18:30 Posters, Drinks and Eats

Tuesday 10 November

08:00 → 08:40 Registration: Arrival Tea & Coffee

08:40 → 10:00 Tuesday Morning Session

08:40 Axion Polarimetric Experiment (APE)

Axionlike particles are compelling ultralight dark matter candidates that may couple weakly to photons and induce minute, time varying rotations of the polarization state of light. Cavity enhanced polarimetry offers a promising route to probing such effects by amplifying small polarization changes over many optical round trips. In particular, a Fabry Perot cavity containing two intracavity quarter wave plates can prevent cancellation of the axion induced polarization signal over successive round trips and convert it into an ellipticity signal suitable for heterodyne detection.

This talk will present the development of an experimental prototype designed to investigate this detection principle. The setup is based on a resonant optical cavity, precision polarization optics, and a heterodyne polarimetric readout. I will describe the experimental concept, the role of the intracavity quarter wave plates, and the expected signal generation mechanism. I will also discuss the practical implementation of the apparatus, including cavity characterization, polarization control, optical loss management, and noise characterization.

This work aims to establish a practical foundation for tabletop searches for axionlike dark matter. The prototype will also provide a testbed for understanding the technical noise limits and experimental requirements of future cavity enhanced polarimetric dark matter detectors.

Speaker: qazal rokn (Max Planck Institute for Gravitational Physics)

08:55 Laser Interferometric Tests of Fundamental Physics at DESY

The ALPS group at DESY has constructed a unique infrastructure for tests of fundamental physics consisting of two strings of 12 HERA dipole magnets. Each string provides 5.3 T magnetic fields over a length of roughly 100 m with cleanrooms in between the magnet strings and at the ends of the experiment. This environment is particularly well suited for experiments that use laser interferometry, such as the light-shining-through-a-wall experiment ALPS II, as the lasers can propagate unperturbed through the long, narrow magnet bore. A number of other experiments are in development to fully exploit both the potential of this infrastructure and the expertise that the group has acquired in interferometric sensing. These experiments include searches for vacuum magnetic birefringence and dichroism that may provide hints of new physics such as axions or string theory, as well as polarimetric searches for axions in the dark matter halo. In this talk I will give a brief introduction to the experimental infrastructure we have built along with our achievements in interferometric sensing, including an update on the status of ALPS II. Then I will discuss our new ideas for experiments that can be implemented within the existing infrastructure and their potential physics reach.

Speaker: Aaron Dean Spector (Deutsches Elektronen-Synchrotron DESY)

09:10 Differential Torsion sensor for direct observation of ultralight vector dark matter

Ultralight vector dark matter is expected to form a coherent oscillating field that can generate tiny, periodic forces detectable by precision instruments. Our differential torsion sensor focuses on detecting differential accelerations between beryllium (Be) and aluminium (Al) test masses, materials chosen for their contrasting neutron-to-mass ratios. By measuring the differential acceleration, the sensor can search for composition-dependent effects arising from couplings between dark matter and ordinary matter.

The sensor operates over a frequency range of approximately 10 mHz to 10 Hz, corresponding to ultralight dark matter masses of roughly $4 \times 10^{-17}$ eV to $4 \times 10^{-14}$ eV. This parameter space remains comparatively unexplored for wave-like dark matter candidates. The experiment's combination of ultra-low-noise operation, long-duration observations, and advanced signal analysis will enable sensitive searches for the persistent narrow-band signatures expected from these dark matter fields.

With target torque sensitivities of $10^{-15} \,–\, 10^{-14}~$N·m Hz$^{-1/2}$, the instrument provides a powerful and complementary approach to existing dark matter searches and astrophysical observations. In this talk I will describe the design of the differential torsion sensor and present the estimated sensitivity performance.

Speaker: Dr Sheon Chua (The Australian National University)

09:25 ADMX-VERA: Innovating Cavity Geometry for Large-Volume, High-Frequency Axion Searches

The Axion Dark Matter eXperiment (ADMX) is a major haloscope experiment that has achieved DFSZ sensitivity at around 1 GHz. VERA (“Volume Enhanced Resonators for Axions”) is an ADMX high-frequency working group that explores new geometries for resonators with volumes far exceeding $\lambda^3$ ($V\gg \lambda^3$). The main objective is to extend ADMX's sensitivity to theoretically motivated axion models up to approximately 40 GHz using the existing magnet infrastructure through a combination of haloscope and detector advancements.
In this talk, I will present two volume-enhanced haloscope concepts and share the latest experimental results. ADMX-Bee, a near-term upgrade under strong consideration by the collaboration, will target the 2.6–5.3 GHz range using the novel “beehive” geometry. This tubable honeycomb resonator is made of a hexagonal array of strongly coupled cavities that produce a single coherent resonance mode, allowing for a volume orders of magnitude larger than a conventional cylindrical cavity operating at the same frequency. We have developed a 19-cell prototype beehive and observed a tunable high-Q resonance across multiple cells at room temperature.
I will also present the recent development in tunable wedge-cavity geometries, which are viable candidates for haloscope resonators above approximately 8 GHz. We developed a prototype 9-11 GHz triple-wedge cavity that features fully independent multi-degree-of-freedom adjustments and power combination. I will present the latest experimental results that demonstrate a coherently resonant cavity with an effective volume greater than $10^2 \lambda^3$ .

Speaker: Sephora Ruppert (Stanford University)

09:40 The DMRadio Program: First Operation of DMRadio-50L and the Path to GUT-Scale Axion Searches

DMRadio-50L is a lumped-element search for axion dark matter in the 5 kHz–5 MHz range, corresponding to axion masses of order 10⁻¹¹–10⁻⁸ eV. It combines a superconducting toroidal magnet, a high-Q tunable LC resonator, and a SQUID-based readout chain operating at mK temperatures to detect the narrowband electromagnetic response induced by axion dark matter.

This talk presents the first operation of the integrated DMRadio-50L system, in which the commissioned magnet, resonator, cryogenic platform, and readout chain function together as a complete axion-search instrument. I will report the first integrated characterization of the detector and its initial deployment in an axion search as well as place DMRadio-50L in the context of the broader DMRadio program, which extends through complementary geometries such as the CAL solenoidal pathfinder and DMRadio-Core. DMRadio-50L establishes the low-frequency platform and provides a testbed for quantum sensors that could accelerate future searches. DMRadio-Core introduces a compact-magnet design that separates the pickup volume from the magnet bore, reducing the magnet's size and stored energy while preserving sensitivity. These efforts form a staged route from the first operation of a full DMRadio resonant search toward future experiments probing well-motivated GUT-scale axion dark matter.

Speaker: Aya Keller (Stanford University)

10:00 → 10:30 Coffee Break

10:30 → 11:10 Plenary Talk

10:30 Hunting New Physics in the Dark Universe

Dark matter provides compelling evidence for physics beyond the Standard Model, motivating a broad landscape of candidates ranging from weakly interacting massive particles to ultralight axions. Astrophysical observations offer a complementary avenue to laboratory experiments for testing dark matter models across a broad range of masses and interaction strengths.

In this talk, I will present novel observational strategies designed to uncover signatures of new physics and highlight the opportunities opened by current and next-generation observatories. I will focus on axions with sub-eV masses, which can decay into near-infrared photons. Using blank-sky observations from the James Webb Space Telescope, I search for the resulting narrow emission line and derive leading constraints on the axion-photon coupling in the eV-scale mass range.

I will also show how cosmic filaments provide a new environment for searching for dark matter, and how different particle processes can produce detectable emission from these structures. Together, these approaches illustrate how previously underexplored astrophysical targets can be transformed into laboratories for hunting new physics.

Speaker: Elena Pinetti (Flatiron Institute/Simons Foundation)

11:10 → 12:00 Tuesday Morning Session

11:10 Search for Axion Dark Matter with the TASEH experiment

The TASEH experiment searches for the Axion Dark Matter with a Haloscope detector, featuring a high-quality-factor cavity with tunable resonance frequency in a uniform magnetic field. The whole setup is maintain at a temperature of few tens of miliKelvin in a Dilution Refrigerator. The system design follows the concept developed by Sikivie and pioneered by ADMX and Haystack experiments.
TASEH conducted its first Axion search near 4.75 GHz in 2021. Currently, the experiment targets the frequency range from 2.0 GHz to 2.3 GHz. The estimated sensitivity is expected to be around 2 times the KSVZ QCD benchmark model. This contribution presents the status of the experiment and the plans for the data taking. Technical challenges and ideas for future upgrades are also reported.

Speaker: Dr Yuan-Hann Chang (Academia Sinica (TW))

11:30 Travelling wave parametric amplifiers for axion halscope experiments

The use of travelling wave parametric amplifiers (TWPAs) represents a convenient and effective readout strategy for axion haloscope experiments. TWPAs produce many GHz of broadband gain, typically covering the entire range of an experimental run, with near-quantum-limited added noise that is increasingly competitive with that of their resonant, narrowband counterparts. Beyond low-noise amplification, phase-dependent parametric amplifiers can generate squeezed vacuum noise. This has been used to enhance haloscope scan rate by permitting cavity overcoupling without the usual penalty to SNR. While squeezing has been demonstrated in single TWPAs, a full squeezed-state receiver has yet to be realised using these devices. Here, we present experimental results regarding the use of a commercially available three-wave mixing TWPA for an axion experiment, focusing on the generation of squeezed vacuum noise via its phase-dependent gain and weighing the broadband benefits against its limitations. Finally, we discuss plans to integrate such devices into a future ORGAN-Q experiment.

Speaker: Graeme Flower (Universtiy of Western Australia)

11:45 Axion 5th force searches with haloscope style detectors

QCD axions are expected to both mediate forces between nuclei and interact electromagnetically. Axion dark matter haloscope searches have exquisite sensitivity, but only to narrow bands of axion masses and rely on axions making up a known quantity of dark matter. 5th force experiments do not rely on dark matter and have a wide axion mass range, but are limited in coupling sensitivity. Is there a way to draw from the strengths of both experiment styles? I will explore the prospects for an electromagnetically sensitive 5th force experiment that is complementary to existing techniques.

Speaker: Gray Rybka

12:00 → 13:20 Lunch Break

13:20 → 15:00 Tuesday Afternoon Session

13:20 Status of the CRESST Experiment

CRESST-III (Cryogenic Rare Event Search with Superconducting Thermometers), installed at Laboratori Nazionali del Gran Sasso, is looking to directly detect dark matter particles scattering off CaWO$_4$ target nuclei in cryogenic detectors. Thanks to its energy threshold O(30 eV), CRESST-III is particularly suitable in probing sub-GeV DM masses. This contribution presents an overview of CRESST-III, reporting the latest DM results and plans for the future. Recent achievements are discussed on the Low Energy Excess (LEE), an unexplained rise of events at low energies (<200 eV). The most recent experimental campaign, using the Double-TES approach to identify the origin of LEE and reject this background, is also discussed.

Speaker: Colin James Moore (Max-Planck-Institut für Physik)

13:40 WIMP Dark Matter Search with the Full-Exposure Data of PandaX-4T

The PandaX-4T experiment, a multi-tonne liquid xenon time projection chamber at the China Jinping Underground Laboratory, searches for dark matter through WIMP-induced nuclear recoils. In this talk, We will present the latest WIMP search results using the full-exposure data set of PandaX-4T. With improved signal reconstruction, detector calibration, and background modeling, new constraints on WIMP–nucleon interactions are derived, achieving competitive sensitivity over a broad WIMP mass range.

Speaker: Yi Tao (Sun Yat-sen University)

14:00 The quantum-limited CASPEr search for axion-like dark matter

Spin-based searches for new fundamental particles and fields use spin ensembles as transducers that are sensitive to spin interactions with fields beyond the standard model. The Cosmic Axion Spin Precession Experiment (CASPEr) is one example. For such searches, the standard quantum limit on sensitivity scales with the inverse square root of the number of spins. Consequently, increasing the size of the spin ensemble presents a compelling approach to improving sensitivity. However, this enhancement demands a proportional reduction in other sources of noise. We detect with quantum-limited sensitivity the spin dynamics of macroscopic ensembles of $5\times10^{21}$ nuclear spins in a solid. We measure the angular spectral density of the collective spin quantum fluctuations with the amplitude $5\times10^{−11}\,$rad$/\sqrt{\rm Hz}$. The root-mean-squared collective spin quantum fluctuation angle is 9 nano-radians. This sensitivity enables us to place new laboratory limits on the EDM and the gradient interactions of ultralight axion-like dark matter.

Speaker: Alexander Sushkov (Johns Hopkins University)

14:20 Status and Prospects of QUAX-PD/LNL

The QUAX (QUaerere AXion) experiment searches for axion dark matter in the 35–45 μeV mass range (8.5–11 GHz) using two complementary cavity haloscopes covering distinct mass regions, located at INFN laboratories in Legnaro and Frascati. This talk will mostly present the results and status of the LNL haloscope, which has already reached near-KSVZ sensitivity above 40 μeV [1]. This is based on a tunable dielectrically loaded copper cavity immersed in an 8 T magnetic field and read out through a quantum-limited detection chain based on a traveling-wave parametric amplifier (TWPA) [1]. The latest results from the most recent data-taking campaigns [2] will be presented for the first time. The talk will also highlight ongoing R&D activities exploiting the recent version of a transmon-based single-photon counter for the readout of hybrid magnon–photon systems [3,4], consisting of a microwave cavity coupled to YIG spheres, as well as for a next-generation conventional axion haloscope based on a tunable cavity equipped with REBCO tapes and operated in a 9 T magnetic field.

[1] “Search for Postinflationary QCD Axions with a Quantum-Limited Tunable Microwave Receiver”, Phys. Rev. Lett. 135, 211002 (2025)

[2] “Search for post-inflationary axions around 40 $\mu$eV with QUAX: Detailed Design, Operations, and Analysis”, in preparation

[3] “Quantum-Enhanced Sensing of Axion Dark Matter with a Transmon-Based Single Microwave Photon Counter”, Phys. Rev. X 15, 021031 (2025)

[4] “Enhancing the sensitivity of single microwave photon detection with bandwidth tunability”, Phys. Rev. Applied 25, 044064 (2026)

Speaker: Danho Ahn (INFN)

14:40 A 1 GHz-range dark photon search with a superconducting Nb$_3$Sn tunable haloscope

Cavity-based searches for wave-like dark matter require microwave resonators combining high quality factors to enhance sensitivity with wide frequency tunability to probe the largest possible range of candidate particle masses. This is particularly important at high frequencies, where the parameter space is largely unexplored due to the poor scaling of the expected signal with the cavity volume, making high-$Q$ resonators essential for preserving experimental sensitivity.

Although superconducting cavities with quality factors as high as $10^{11}$ have been demonstrated for wave-like dark matter searches, achieving such performance together with wide frequency tunability remains a major challenge. In this contribution we present the tuning-by-opening technique that we demonstrated with a superconducting Nb$_3$Sn-coated cavity resonating around $9\,\mathrm{GHz}$ [1]. We accomplished frequency tuning by varying the gap between two cavity halves, enabling a tuning range exceeding $1\,$GHz while maintaining an unloaded quality factor above $10^6$, with no observed mode crossing throughout the explored range.

Building on these results, we set new limits on the dark photon parameter space, excluding kinetic mixing values $|\varepsilon| \gtrsim 5\times10^{-13}$ over the $7.7 -8.9\,\mathrm{GHz}$ frequency range using six week of data taking [2]. We also introduce a novel haloscope operation strategy in which the cavity resonance is continuously tuned at a constant rate while being tracked through the injection of a weak thermal noise signal. This approach results only in a negligible loss of experimental sensitivity, while providing a practical scanning protocol for next-generation superconducting haloscopes.

[1] https://arxiv.org/abs/2603.08175v1.

[2] \textit{A 1-GHz dark photon search with a widely tunable superconducting haloscope}, in preparation.

Speaker: Dora Maiello (Università di Padova, INFN Padova)

15:00 → 15:30 Coffee Break

15:30 → 17:00 Tuesday Afternoon Session

15:30 Black hole scalar sirens in the Milky Way

Hypothetical light scalar particles trigger the superradiant instability around spinning black holes (BHs), causing clouds of scalars to grow around the BH. In the presence of sufficiently strong particle self-interactions (characterized by the decay constant $f$), scalars are ejected from BH orbits, resulting in coherent, non-relativistic emissions that continuously carry away the BH's angular momentum. Parameters exist for which cloud growth is much faster, and scalar depletion is much slower, than the age of the Galaxy. This defines a distinct class of astrophysical sources of scalars, which we call BH scalar sirens -- BHs that persistently emit scalars effectively forever. We compute the scalar background from the expected population of $N_\text{BH}\sim 10^{8}$ isolated stellar-mass BHs in the Milky Way, which are sirens for scalars in the mass range $10^{-13}$--$10^{-11}\,$eV and $f\lesssim 10^{14}$--$10^{9}\,$GeV. This provides a detection target independent of early-universe scalar production or cosmological initial conditions. The generated observable signals are up to two orders-of-magnitude larger than those expected from a misaligned cosmic scalar in this mass range. The energy spectrum of emitted scalars is distinctly broader and at higher velocities (up to $\sim 10^{-1}c$) than that of virialized dark matter, and encodes the mass and spin distributions of the BH population. While stellar-mass Milky Way BHs are our primary target, our framework extends to supermassive, intermediate-mass and light BHs. Given the difficulty of directly observing populations of isolated BHs, scalar emissions offer a novel probe of these otherwise invisible objects, highlighting the potential for joint discovery between scalars and BHs, and broadly motivating searches for scalars over many orders-of-magnitude in mass.

Speaker: Daniel Gavilan-Martin

15:50 The theory of Axion Relic Pockets

Axion relic pockets (ARPs) can form in cosmic phase transitions and comprise all of dark matter. The pocket interiors are filled by the false vacuum phase, stabilised against collapse by a hot, kinematically trapped axion gas: ARPs are balloons filled with relativistic axions. I will review the theory and phenomenology of ARPs, and report on recent progress in understanding their formation and stability when the axion couples to matter, including prospects for observable signatures at terrestrial experiments and astronomical observatories.

Speaker: David Marsh (Stockholm University)

16:10 The Very Entangled Bose Array eXperiment: A Pathfinder to Heisenberg-limited Multi-cavity Axion Haloscopes

The axion, first proposed to resolve the unobserved-yet-expected CP violation in QCD, is an excellent candidate for wave-like dark matter. The most successful experimental technique to search for galactic axions thus far, the cavity haloscope, is limited in both scan speed and accessible axion mass range (or frequency range), particularly above 1.5 GHz. Next generation axion haloscopes will scan higher frequencies using arrays of identical cavities, presenting new opportunities to use quantum technologies to surpass the standard quantum limit beyond the squeezing and state-swapping techniques being explored for single-cavity searches. Inter-cavity multi-mode correlations have the potential to further elevate the scan rate of an array from linear scaling with cavity number to quadratic at the Heisenberg limit. This talk presents efforts at PNNL (Pacific Northwest National Lab), WUSTL (Washington University in St. Louis), UCB (University of California Berkeley), & LLNL (Lawrence Livermore National Lab) as part of the VEBAX pathfinder building capability to prepare and measure multi-mode states in tunable axion cavity haloscope arrays, forging a way for searches to reach the Heisenberg limit.

Speaker: Erik Lentz (Pacific Northwest National Laboratory)

16:25 Status of Solar B8 CE𝜈NS and Light Dark Matter Search in PandaX-4T

PandaX-4T is a multi-tonne liquid-xenon experiment searching for rare low-energy interactions, operating with a 3.7-tonne active target at the China Jinping Underground Laboratory (2400 m.w.e. overburden). In 2024, PandaX-4T reported the first indication of coherent elastic neutrino–nucleus scattering (CE𝜈NS) from solar B8 neutrinos using combined Run0 and Run1 data, with a significance of 2.64𝜎. This talk will summarize the analysis that led to that result and will present the current status of the CE𝜈NS search, as well as search for light dark matter in the same energy region, using newly accumulated Run2 exposure.

Speaker: Qing Lin (University of Science and Technology of China)

16:40 PandaX-20T Upgrade and Its Physics Potential

PandaX is a series of liquid xenon experiments at the China Jinping Underground Laboratory. Following the successful operation of PandaX-4T, the collaboration is now advancing toward the next-generation PandaX-20T experiment, with a substantially enlarged target mass and further improvements in detector performance and background control.

PandaX-20T will introduce major upgrades in key detector technologies, including new photomultipliers for cryogenic operation, low-background flexible circuit boards, large-area electrodes and high-voltage systems, and a full-chain electronics and data acquisition system. Large-scale xenon storage, recovery, purification and circulation systems are also being developed, together with krypton and radon distillation, material screening, radon control, and comprehensive background assessment.

With its larger exposure and lower background, PandaX-20T will extend the sensitivity to dark matter interactions and enable a broad rare-event physics program, including solar and astrophysical neutrinos, neutrinoless double-beta decay, and other searches for physics beyond the Standard Model. This talk will present the PandaX-20T upgrade strategy, key technological developments, and its expected physics reach.

Speaker: Yue Meng (Shanghai Jiao Tong University)

18:30 → 20:30 Public Lecture: Quantum Technology

Wednesday 11 November

08:00 → 08:40 Arrival Tea & Coffee

08:40 → 10:10 Wednesday Morning

08:40 Direct and indirect probes of gravity-mediated dark matter in large extra dimensions scenario

Dark matter coupled to the Standard Model only through gravity is usually regarded as beyond the reach of laboratory searches. In models with large extra dimensions this expectation can be altered, since the short-distance gravitational potential is enhanced and scales as ($1/r^{1+n}$). I will discuss dark-matter scattering in Arkani-Hamed–Dimopoulos–Dvali scenarios, where exchange of Kaluza–Klein graviton modes induces an effective dark-matter–nucleon interaction. Confronting this interaction with xenon-based direct-detection data gives bounds on the fundamental higher-dimensional Planck scale, with the strongest sensitivity for heavy dark matter in two extra dimensions. I will also discuss complementary constraints from resonant scalar dark-matter annihilation through on-shell Kaluza–Klein modes into Standard Model final states. These results show that gravitationally mediated dark matter can be probed by a combination of underground direct detection, collider limits, and indirect gamma-ray searches.

Speaker: Igor Samsonov (UNSW)

08:55 Microwave Cavity Searches for Axion Dark Matter at IBS-DMAG

The QCD axion is a compelling dark matter candidate motivated by the Peccei–Quinn solution to the strong CP problem. The IBS Dark Matter Axion Group (IBS-DMAG) searches for axion dark matter using cavity haloscopes, where axion–photon conversion is enhanced by strong magnetic fields and high-Q microwave resonators. In this talk, I will present recent IBS-DMAG results, highlighting the experimental techniques that enable high sensitivity, including cryogenic operation, ultra-low-noise microwave detection, and advanced cavity designs. I will also discuss future directions for extending axion searches toward higher masses and broader axion parameter space.

Speaker: Sung Woo YOUN (IBS-DMAG)

09:15 Latest Results and Prospects from the XENONnT Experiment

The XENONnT experiment operates a dual-phase liquid xenon time projection chamber at the INFN Laboratori Nazionali del Gran Sasso, designed primarily to search for weakly interacting massive particles (WIMPs). Thanks to its ultra-low background rate and low energy threshold, XENONnT is also uniquely sensitive to a wide range of rare processes, including coherent elastic neutrino-nucleus scattering (CEvNS) from solar boron-8 neutrinos, sub-GeV dark matter searches, neutrinoless double beta decay and others.
In this talk, I will present the latest results from XENONnT, highlighting its ongoing efforts to probe dark matter interactions and rare event phenomena. The discussion will include recent advancements and the experiment’s expanding sensitivity to both high- and low-mass dark matter candidates.

Speaker: Sara Diglio (SUBATECH/CNRS/In2p3)

09:35 Testing Antimatter Couplings with Spectroscopy and Other Methods

We investigate how scalar-mediated potentials with Lorentz-violating couplings to Standard Model fermions affect spectroscopic observables in atoms and highly charged ions. Suitable combinations of an ordinary scalar and a time-like component of a Lorentz violating vector coupling allow for a split into "matter" and "antimatter" couplings, at least in the non-relativistic limit. By considering hydrogen and antihydrogen spectra, we access both matter and antimatter couplings. While relativistic effects alone lift degeneracies in ordinary hydrogen, providing indirect access to antimatter couplings, comparisons with antihydrogen measurements lead to significantly improved sensitivity to the antimatter couplings. In highly charged ions, enhanced relativistic effects further amplify the sensitivity, compensating for reduced experimental precision. We obtain the strongest bounds to date for scalar masses $m_\phi \gtrsim 100\:\mathrm{keV}$. For comparison, we estimate astrophysical constraints on the same parameter space, providing strong bounds even on antimatter couplings despite stars being predominantly composed of matter.

Speaker: Lucas Puetter (ITP Heidelberg)

09:55 Electron-coupled dark matter search with an ultrasensitive superconducting magnetometer

Ultra-low mass axion-like particles are well-motivated dark matter candidates. The wave-like behaviour in the sub-eV mass range is leveraged for searches for this possibility via coupling to fermion spins. In the non-relativistic limit, spins experience this dark matter background as a minuscule pseudo-magnetic field that can be measured exploiting quantum sensing methods. Here, we explore a way to use a non-spin magnetometer, a superconducting quantum interference device in conjunction with a magnetic shield, to probe this regime. With this method, we improve terrestrial bounds on axion-like particles in a range covering about six orders of magnitude.

Speaker: David Herbschleb (QUP, KEK)

10:10 → 10:40 Coffee Break

10:40 → 12:00 Wednesday Morning

10:40 DALI: First Results and Future Prospects

The Dark-photons & Axion-Like particles Interferometer (DALI) is a novel haloscope concept designed to search for axions and dark photons above 25 μeV using a large area magnetized phased array and a tunable Fabry–Pérot resonator. A proof-of-principle demonstrator operated at the Instituto de Astrofísica de Canarias has successfully validated the core DALI technologies and produced the first physics quality dark matter results, demonstrating the promise of resonant phased-array detectors for high frequency searches. We present the status and first results of the demonstrator, along with plans for future upgrades that will extend the search to a broader mass range and improve axion and dark photon sensitivities.

Speaker: Abaz Kryemadhi (Messiah University)

11:00 First searches for axion and dark photon dark matter with MADMAX prototypes

The QCD axion is a well-motivated hypothetical particle that simultaneously addresses the strong CP problem and constitutes a compelling cold dark matter candidate. The MADMAX experiment (Magnetized Disk and Mirror Axion Experiment) is designed to search for dark matter axions and similar particles (axion-like particles and dark photons) in the mass range of 40–400 μeV by boosting the microwave radiation in the range of 10-100 GHz induced by the inverse Primakoff effect in a dielectric haloscope. Several small scale prototype systems have been tested these last three years, allowing to validate the dielectric haloscope concept and obtain competitive results of axion and dark photon dark matter searches. This talk will present an overview of the MADMAX experiment, summarize the recent results, the ongoing research and development and the remaining challenges.

Speaker: Akira Miyazaki (Université Paris-Saclay (FR))

11:20 The FLASH and QUAX-LNF Haloscopes in the GravNet Network

GravNet is an international collaboration developing a distributed network of quantum-enhanced haloscopes to search for light dark matter and high-frequency gravitational waves (HFGWs) in the MHz-GHz frequency range. By coherently combining time-synchronized resonant detectors, GravNet aims to significantly extend the sensitivity achievable with individual experiments. The collaboration exploits the complementarity of resonant cavities operating over a wide frequency range and integrates state-of-the-art haloscope technology with emerging quantum sensors. Besides probing axions, axion-like particles, and dark photons, GravNet will explore the detection of HFGWs through the inverse Gertsenshtein effect, opening new opportunities to investigate the early Universe and other exotic astrophysical phenomena.

The first part of this talk will introduce the GravNet concept, its scientific objectives, and the current status of the collaboration, including ongoing developments in detector networking, HFGW–cavity coupling modelling, quantum sensing, and multimode data acquisition. The second part will focus on the two haloscope concepts being developed at INFN-LNF: FLASH and QUAX-LNF. FLASH is a large-volume (4 m³) tunable cavity operating in the 100–300 MHz range, designed to explore a largely uncharted region of the light bosonic dark matter parameter space. QUAX-LNF is a compact haloscope operating around 9 GHz, providing complementary sensitivity at higher frequencies while serving as a testbed for advanced quantum technologies. Together, these two detectors exemplify the broad frequency coverage and complementary experimental approaches that form the foundation of the GravNet network, paving the way toward a scalable observatory for light dark matter and high-frequency gravitational waves.

Speaker: Alessio Rettaroli (INFN - LNF)

11:40 DOSUE-RR: New Results of a Dark Photon Dark Matter Search with a Millimeter-Wave Receiver in the 80–160 μeV/c² Mass Range

We report on a direct search for dark photon dark matter with the DOSUE-RR experiment in the mass range of 80–160 $\mu \rm{eV}/c^2$, corresponding to 19-38 GHz. Dark photon dark matter can convert into ordinary photons at a conducting surface, producing a narrow-band millimeter-wave signal whose frequency is determined by the dark photon mass. The experiment searches for this signal using a cryogenic millimeter-wave receiver and a metallic conversion surface.

The present search builds on our previous measurement in the 80–110 $\mu \rm{eV}/c^2$ region and extends the search up to 160 $\mu \rm{eV}/c^2$. A key upgrade is a newly developed wide-band deadtime-free spectrometer using a RFSoC chip, which replaces the former commercial 2 MHz-band spectrometer and enables simultaneous acquisition over a bandwidth of up to 4 GHz. In the present search, this wide-band acquisition increased the effective integration time per frequency by more than four orders of magnitude compared with our previous measurement. With this improved sensitivity, we extended the search to 160 $\mu \rm{eV}/c^2$ and reached sensitivity to kinetic-mixing values more than an order of magnitude below representative existing indirect constraints over most of the 110–160 $\mu \rm{eV}/c^2$ region.

We will present the experimental setup, calibration procedure, data analysis, and preliminary search results in the 80–160 $\mu \rm{eV}/c^2$ mass range.

Speaker: Hiroki Takeuchi (Kyoto University)

12:00 → 12:20 Packed Lunch

12:20 → 16:20 Excursion: Caversham Wildlife Park

18:30 → 23:00 Conference Dinner: Fraser's Restaurant Kings Park

Thursday 12 November

08:00 → 09:00 Arrival Tea & Coffee

09:00 → 10:10 Thursday Morning Session

09:00 Quantum Error Correction-like Noise Mitigation for Wave-like Dark Matter Searches with Quantum Sensors

We propose a quantum error correction-like noise mitigation protocol for enhancing the sensitivity of wave-like dark matter searches with quantum sensors. Our protocol uses multiple sensors to mitigate the noise affecting each sensor individually, allowing for the suppression of excitation noise that is parallel to the dark matter signal. We demonstrate that our protocol can improve the sensitivity to dark matter signals by a factor of $\sqrt{N}$, where $N$ is the number of sensors used, for small $N$. Furthermore, for sufficiently large $N$, we find that our protocol achieves the same performance as the standard quantum limit by the ideal measurement, which non-entangled sensors with parallel noise cannot reach due to the unknown phase of the dark matter field.
Our work can be widely applied to various types of signals with unknown phases, and has the potential to enhance the sensitivity of quantum sensors such as arrays of resonant cavities.

Speaker: Hajime Fukuda (University of Tokyo)

09:15 The Twisted "Anyon" Cavity: Using Electromagnetic Helicity to Search for Ultralight Dark Matter

Twisted, helical "anyon" cavity resonators support bulk electromagnetic modes with nonzero helicity, a chiral property arising from the net parallel or antiparallel alignment of the eigenmode’s electric and magnetic fields. This property allows a single, monochromatic mode to couple directly to dark matter axions and convert them into amplitude-modulation sidebands via the axion-photon chiral anomaly, without requiring an external magnetic field. Removing this requirement allows such resonators to be built from superconducting materials, which reduce surface losses and substantially enhance sensitivity to axions with equivalent frequencies from DC to the cavity bandwidth. We propose a detection scheme for ultralight dark matter axions over the mass range $10^{-18}–10^{-13.7}$ eV, with projected limits determined assuming manufacture from bulk-niobium operated at superconducting temperatures, with an estimated sensitivity of $g_{a\gamma\gamma} < 10^{-11}$ GeV$^{-1}$ for an acquisition time of 3 months, reaching approximately one order of magnitude below the current exclusion limits set by CAST in this mass range. A microwave interferometric readout architecture is also described for detecting these axion-induced sidebands at this sensitivity limit, as well as potential improvements that could probe to lower exclusion limits.

Speaker: Jeremy Bourhill

09:30 Status of the BREAD axion search experiments

The Broadband Reflector Experiment for Axion Detection (BREAD) concept employs a novel coaxial dish antenna geometry to convert axions to photons in the background magnetic field of a large solenoid magnet. This detector geometry provides a scalable approach to detection of axions in mass ranges above the reach of the resonant cavity technique employed by the ADMX, HAYSAC and CAPP collaborations and others. We will review recent results from the GigaBREAD experiment which produced the best lab constraints on axion like particles in the mass range 44-52 microeV as well as ongoing R&D in the BREAD collaboration on techniques for achieving sensitivity to the QCD axion in mass ranges up to ~1 eV.

Speaker: Andrew Sonnenschein (Fermi National Accelerator Laboratory)

09:50 Targeting the QCD axion with novel cavities and qubit-based electronics

Discovering the QCD axion will require a fleet of high-Q cavities, large magnets and cryostats, and background-free single photon detectors. In this talk, I will report on the successful operation of a novel dielectric cavity that is tunable over a 20% frequency range while maintaining high quality factor. Coupled with a qubit-based single microwave photon counter with similarly large frequency tunability, this experiment will have sensitivity to DFSZ axion-photon coupling strengths. I will also present ideas on the processing of quantum data, pre-wavefunction collapse, using current and future quantum computers.

Speaker: Aaron Chou

10:10 → 10:40 Coffee Break

10:40 → 11:20 Plenary Talk

10:40 From prehistoric qubits to building a useful quantum computer

In the span of four decades, quantum computation has evolved from an intellectual curiosity to a potentially realizable technology. I will describe my thesis work on macroscopic quantum tunneling and energy-level quantization that led to the Nobel Prize, as well as several other important experiments that advanced superconducting qubits.

Nevertheless, the path toward a full-stack scalable technology is a work in progress. There are significant outstanding quantum hardware, fabrication, architecture, and algorithmic challenges that must be solved. Here, we show how the road to scaling could be paved by adopting existing semiconductor technology to build much higher-quality qubits and employing system engineering approaches.

Speaker: Prof. John Martinis (University of California Santa Barbara)

11:20 → 12:00 Thursday Morning Session

11:20 ORGAN: Current Status and Future Directions of Australia's Axion Haloscope Experiment

The ORGAN (Oscillating Resonant Group AxioN) Experiment is Australia's axion haloscope program, searching for high-mass axion dark matter through a collaboration spanning the University of Western Australia and Swinburne University of Technology. Data-taking campaigns to date have placed leading exclusion limits on axion-photon coupling across the 25–112 μeV mass range, and the collaboration is now pursuing several parallel upgrades to extend both sensitivity and frequency coverage.

Central to this effort is ORGAN-Q, the next iteration of our quantum-enhanced search, which will implement a squeezed-vacuum receiver to circumvent the standard quantum limit and accelerate the scan rate beyond what quantum-limited amplification alone can achieve. In parallel, ORGAN-2A plans to employ a DC-tunable rectangular cavity, tuned via a piezoelectric flexure stage, coupled to a kinetic inductance parametric amplifier (KIPA) for low-noise readout. To extend the program to lower axion masses, ORGAN-LF is currently operating at Swinburne University of Technology, targeting the 100–500 MHz range.

This talk presents an overview of these developments, recent results, and the outlook for the ORGAN program.

Speaker: Aaron Quiskamp` (UWA)

11:40 High-Q Cavities and Quantum Sensing Platforms for Fundamental Physics at SQMS

The SQMS Center develops state-of-the-art superconducting and quantum technologies for ultra-sensitive searches for physics beyond the Standard Model. By combining superconducting radio-frequency cavities with quantum devices, SQMS is pursuing a broad experimental program targeting axion and dark photon dark matter, high-frequency gravitational waves, and other weakly interacting particles. This talk will begin with a short overview of the SQMS quantum sensing program, highlighting the enabling technologies and the range of experimental efforts currently underway.

The talk will then focus on representative experiments, that may include SHADE (Superconducting Heterodyne Axion Dark matter Experiment), a search for ultralight axions based on heterodyne frequency conversion in superconducting cavities, and the recent Dark SRF results from the reanalysis of the experimental data using an improved treatment of cavity frequency fluctuations. The latter analysis provides a more robust framework for mitigating frequency instabilities and is expected to benefit future cavity-based dark matter searches across the SQMS program.

Speaker: Bianca Giaccone

12:00 → 13:20 Lunch Break

13:20 → 15:00 Thursday Afternoon Session

13:20 Probing light dark matter with cryogenic detectors and the TESSERACT experiment at LSM : progress and status.

Cryogenic detectors are of great interest to search for the elusive signal induced by a light dark matter particle impinging inside a target material. Unfortunately, every cryogenic experiment with a very low energy threshold is limited by a low-energy excess background known as LEE whose origin is not totally understood to this date. The proposal of the TESSERACT collaboration is to bring multiple cryogenic detectors, with LEE rejection capabilities, in the same underground experimental space. The complementarity of targets and technologies will allow for a better understanding of backgrounds and systematics as well as providing a way to confirm any potential future detection. The proposed talk will cover the experimental setup at LSM, the detector technologies, and the preliminary science potential of TESSERACT.

Speaker: Jules COLAS

13:40 ALPHA Plasma Haloscope for Post Inflation Axions

Plasma haloscopes offer a compelling methodology for probing higher-mass axions, particularly above 10 GHz---a parameter space strongly favored by recent post-inflationary cosmological simulations. Utilizing wire metamaterial resonators, the ALPHA collaboration is preparing for its Phase 1 run, with the first scientific run anticipated in early 2028, to target the 10 to 20 GHz frequency range. While awaiting the delivery of the main solenoid magnet, we are commissioning our dilution refrigerator and a Josephson parametric amplifier, integrated with a spiral-based tunable wire array resonator, to conduct a dark photon dark matter search. In this talk, I will present the current status of ALPHA Phase 1 and discuss this ongoing dark photon experimental run, which serves as a comprehensive verification of our cryogenic, tuning, and amplification systems prior to magnet integration.

Speaker: Junu Jeong (Stockholm University)

14:00 Solar Axion Searches with IAXO and BabyIAXO

The sun could be a large axion emitter and thus an interesting object to study for axion searches. The International AXion Observatory (IAXO), as a next-generation axion helioscope, aims exactly for that purpose. The experiment will host a $20\,\text{m}$ long magnet with eight magnet bores and will be able to follow the sun for 12 hours per day. Each magnet bore will be equipped with a detector setup, most likely consisting of an X-ray optic followed by a low-background detector. IAXO aims for a sensitivity to the axion-photon coupling of $g_\text{aγ}$ around a $\text{few}\times 10^{12}\,\text{GeV}^{-1}$, exceeding the current limits at by the CAST experiment by more than an order of magnitude.
As an intermediate step and technology demonstrator, a smaller version of the experiment, called BabyIAXO, is currently being built at DESY in Hamburg (Germany). It will host a $10\,\text{m}$ long magnet with two bores of $70\,\text{cm}$ diameter each. Similar to IAXO, the experiment can track the sun for 12 hours per day, allowing advanced studies on all experiment subsystems while having at the same time physics potential beyond the current best limits for solar axions. Many components of the BabyIAXO experiment have already been produced; however, the superconducting magnet, as one of the major parts of the experiment, experienced some delays over the past years. This talk will present the current state of the BabyIAXO and IAXO experiment and an overview on the aimed physics searches.

Speaker: Tobias Schiffer (University of Bonn (DE))

14:20 SUPAX at Bonn: A 10 mK, 12 T Multi-Cavity Haloscope for Axion Dark Matter Searches between 2 and 7 GHz

The SUPerconducting AXion search experiment, SUPAX, is a new axion haloscope currently being built at the University of Bonn to search for axion and axion-like particle dark matter in the microwave regime. The experiment will operate inside a 12 T superconducting solenoid at a base temperature of about 10 mK and will employ tunable microwave cavities covering resonance frequencies from 2 GHz to 7.2 GHz, corresponding to axion masses of approximately 8–30 μeV. A central design feature is a compact multi-cavity system that maximizes the available magnetized volume while enabling the simultaneous scan of several frequency bands.

The first phase will use high-purity copper cavities, with superconducting ReBCO-coated cavities foreseen as an upgrade to increase the quality factor and hence the scan rate and coupling reach. The readout is based on a near-quantum-limited microwave receiver chain using traveling wave parametric amplifiers followed by cryogenic HEMT amplification. With this configuration, SUPAX aims reach sensitvity to the QCD axion band over parts of the 8–30 μeV mass range within one year measurement time. The projected scan rates are strongly enhanced by the multi-cavity concept and by the planned transition from normal-conducting to superconducting resonators.

In this contribution, I will present the experimental concept of SUPAX, the status of the Bonn installation, the cavity and tuning design as well as the expected sensitivity prospects. I will also report on results from the pathfinder experiment operated at Mainz, including dark-photon searches and first axion-search results in a narrow mass window, and will outline the planned data-taking program with the new Bonn setup.

Speaker: Kristof Schmieden (University of Bonn (DE))

14:40 Constraints on Axion-Like Particles from Ten Years of Blazar Observations with MAGIC and LST-1

Axion-like particles (ALPs) are well-motivated extensions of the Standard Model that can induce photon–ALP oscillations in the presence of external magnetic fields. For very-high-energy (VHE) gamma rays, these oscillations may leave observable signatures in the spectra of astrophysical sources, such as energy-dependent flux fluctuations or spectral hardening at TeV energies.

We present a comprehensive search for ALP-induced effects using observations of four blazars (Mrk421, Mrk501, BL Lac and 1ES 1959+650, for a total of more than 900 hours) collected over a decade (2014–2024) with the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescopes and the first Large-Sized Telescope (LST-1) of the Cherenkov Telescope Array Observatory (CTAO). Their broad energy coverage and energy resolution make them particularly well suited to resolve the spectral features expected from photon–ALP oscillations.

Using a Bayesian block analysis, we identify periods of approximately steady VHE emission and construct homogeneous data subsets for the ALP search. For each source, we model photon–ALP conversions occurring within the blazar jet and in the Galactic magnetic field and compute the corresponding photon survival probability. We further develop a modular statistical framework that combines multiple datasets, sources, and instruments directly at the likelihood level, maximizing the sensitivity to a common ALP signal.

No statistically significant evidence is found for ALP-induced phenomena in the VHE emission from the analyzed blazars. We therefore derive upper limits on the ALP–photon coupling strength over the ALP mass range of 1 to 1000 neV, demonstrating the potential of joint multi-source and multi-instrument analyses to probe the ALP parameter space with current and next-generation Cherenkov telescopes.

Speaker: Giacomo D'Amico

15:00 → 15:25 Coffee Break

15:25 → 16:55 Thursday Afternoon Session

15:25 Constraining axionlike dark matter with a radio-frequency atomic magnetometer

Axionlike dark matter may generate an oscillating pseudomagnetic field
through its gradient coupling to fermion spins. We report on the results
of a recent search [1] for this interaction using a
radio-frequency $^{87}\mathrm{Rb}$ atomic magnetometer, whose Larmor
frequency is scanned to provide broadband sensitivity. The measurement
probes axionlike-particle (ALP) masses between
$2.40\times10^{-10}$ and $2.11\times10^{-9}\,\mathrm{eV}/c^{2}$.
The recorded magnetic field spectra are searched for features consistent
with an ALP-induced signal. In the absence of significant ALP candidate
signals, we derive limits on the ALP couplings to protons, neutrons, and
electrons. The proton result improves on previous laboratory constraints
in the investigated mass range, while the neutron and electron limits
provide complementary bounds. These results demonstrate the applicability
of radio-frequency atomic magnetometers to broadband searches for
axionlike dark matter.

[1] A. Rigoulet, S. Nanos, I. K. Kominis, and D. Antypas, Phys. Rev. D 113, 072011 (2026).

Speaker: Dionysios Antypas (University of Crete)

15:40 Revising Indirect Dark Matter Constraints with Updated Astrophysical J-Factor Priors

In the past decade, indirect searches for particle dark matter with gamma-ray experiments have placed stringent constraints on the annihilation cross section or decay lifetime across a wide range of dark matter masses. These limits depend critically on the astrophysical J factor, which encodes the dark matter distribution in the target and typically dominates the systematic uncertainty. As improved observational data and dynamical modeling revise current J-factor determinations, many published limits risk becoming outdated unless the full analyses are repeated.

We derive an analytic expression that quantifies how limited knowledge of the astrophysical J factor affects upper limits. This expression can be used to update published dark matter limits when revised J-factor estimates become available, without requiring access to the full experimental likelihood. The formalism applies to analyses with both Gaussian and log-normal priors on the J factor and is validated with Monte Carlo simulations and by reproducing published limits.

We further show its extension to the combination of multiple targets, allowing combined limits to be updated using only publicly available limits.

This framework enables existing indirect-detection results to be re-evaluated as astrophysical inputs improve, preserving and extending the scientific value of current and future gamma-ray searches for dark matter.

Speaker: Giacomo D'Amico

15:55 Probing Majoron Dark Matter with Gravitational Wave Detectors

In this talk, I will present a novel method for probing Majoron dark matter using optical interferometry, such as that employed in gravitational wave detectors. The Majoron is a (pseudo-) Nambu-Goldstone boson that arises when a Majorana neutrino mass term is generated through the spontaneous breaking of a global Lepton symmetry, and has been proposed as a viable dark matter candidate in our universe. Although the original Majoron model did not include couplings to photons, a recent variant model has shown that Majoron can indeed couple to photons via a chiral anomaly [Q. Liang, X. P. Daz, T. T. Yanagida, Phys. Rev. Lett. 134, 151803 (2025)]. If such Majoron constitutes dark matter, it interacts differently with right- and left-handed polarizations of propagating light, leading to a small difference in phase velocity and inducing a rotation of the polarization direction. This rotation oscillates at a frequency determined by the Majoron mass, opening up the possibility of detecting the signal as a time-varying interference pattern using optical cavities. Optical interferometry, as employed in gravitational wave detectors, is among the most precise measurement techniques available and is capable of detecting extremely small changes in the phase velocity of laser beams. In our previous work, we demonstrated that the polarization rotation effect caused by axion dark matter can be detected using interferometric techniques, establishing a new direction for dark matter searches [I. Obata, T. Fujita, Y. Michimura, Phys. Rev. Lett. 121, 161301 (2018); K. Nagano, T. Fujita, Y. Michimura, I. Obata, Phys. Rev. Lett. 123, 111301 (2019)]. Interestingly, within the standard seesaw mechanism for neutrino masses, the expected Majoron dark matter mass lies in the range of 1e-14 eV to 1e-10 eV, corresponding to oscillation frequencies from a few Hz to kHz, which aligns precisely with the sensitive frequency band of gravitational wave detectors. In this talk, I will present the predicted parameter space for the Majoron dark matterphoton coupling and discuss the prospects for testing this interaction with current and upcoming gravitational wave experiments.

Speaker: ippei obata

16:10 Primordial Black Hole Dark Matter from Axion-like Fields

We investigate the formation of dark matter primordial black holes (PBHs) from two types of axion-like fields. In the first scenario, an axion-like field plays the role of the inflaton. We study PBH formation in axion inflation with a bumpy potential using lattice simulations. In particular, we compute the power spectrum of curvature perturbations in the strong backreaction regime and show that the resulting spectrum can lead to the formation of PBHs that account for all of the dark matter in the Universe. In the second scenario, we consider an axion-like curvaton model, in which a sharp peak in the curvature perturbation power spectrum is generated by the dynamics of a scalar field whose phase direction corresponds to an axion-like field. This model can also produce PBHs with various masses, including PBHs that can account for all of the dark matter.

Speaker: Masahiro Kawasaki

16:25 Primordial Black Hole Dark Matter from Non-Topological Solitons

Non-topological solitons arising in theories beyond the Standard Model can generate sizable Poisson density fluctuations in the early Universe. If the solitons temporarily dominate the energy density, these fluctuations grow during the resulting early matter-dominated era and can collapse into primordial black holes (PBHs), providing a possible origin of dark matter. Previous studies of this scenario assumed a monochromatic soliton mass distribution and did not fully address PBH formation from perturbations generated inside the horizon. We develop a general framework for evaluating density perturbations arising from an arbitrary soliton mass distribution and clarify the collapse condition for sub-horizon perturbations during an early matter-dominated era. Applying the formalism to gauge-mediated Q-balls with a charge distribution obtained from lattice simulations, we show that the resulting PBHs can constitute all of the dark matter.

Speaker: Shunsuke Neda (Institute for Cosmic Ray Research, The University of Tokyo)

16:40 Dark Matter and Majorana Neutrinos in a Realization of the Higgs Metastability Bound

The apparent fine-tunings of the Standard Model Higgs potential may be a consequence of its near-criticality. If its parameters are selected by an underlying mechanism that places the theory near criticality, then the scale of vacuum instability sets an upper bound on the Higgs mass. This reframes the hierarchy problem as a consequence of vacuum metastability and predicts new physics that destabilizes the Higgs potential at or just above the electroweak scale. Working within this hypothesis, I will present a new physics scenario that achieves a competitive metastability bound on the Higgs mass while simultaneously explaining the origin of neutrino masses and the production of dark matter. This scenario predicts sharp experimental targets correlated across the neutrino and dark sectors, with decisive experimental signatures in near-future collider searches that will conclusively test the broader class of models it represents.

Speaker: Dr Patrick Fitzpatrick (Department of Physics & Astronomy, University of New Hampshire)

17:45 → 20:05 Optional Fremantle Tours: Little Creatures Pub etc.

Friday 13 November

08:00 → 08:40 Arrival Tea & Coffee

08:40 → 09:25 Friday Morning Session

08:40 Where can Dark Matter be hiding?

The absence of signals in Dark Matter (DM) detection experiments to date motivates scenarios in which the leading detection signals are absent or suppressed. We examine two such cases, using the framework of Effective Field Theory.

i) Pseudoscalar-mediated dark matter: For fermionic DM that is coupled to Standard Model (SM) fermions via pseudoscalar interactions, the tree-level elastic scattering amplitude is extremely small – it is both momentum suppressed and spin-dependent. However, a spin independent scattering amplitude can be induced at loop level and can dominate over the highly suppressed tree level amplitude.

ii) Neutrino portal dark matter: If DM coupled to the SM only via couplings to neutrinos, it would have evaded detection. We ask whether it is possible for DM-neutrino interactions to account for the observed DM relic abundance through standard thermal freeze-out, without violating bounds on neutrinos or charged leptons.

Speaker: Prof. Anthony Williams (University of Adelaide)

08:55 Cosmological tests of thermal axions

Axions can be produced thermally in the Early Universe leaving imprints in cosmological observables. I will discuss recent developments in the computation of the abundance of thermally produced axions and present improved cosmological constraints on axion interactions. Cosmology provides the strongest constraints to date on several axion couplings. Based on 2410.18186 and 2511.14864 and some preliminary results.

Speaker: Prof. Marcin Badziak (University of Warsaw)

09:10 Sub-Kelvin characterization of the BAUSCIA detector

We report the full sub-Kelvin characterization of the BAUSCIA high-frequency gravitational-wave antenna and the current status of its pilot science run. The detector is based on cryogenic Bulk Acoustic Wave resonators coupled to SQUID amplifiers for signal readout. An end-to-end characterization of the experimental chain, from the resonators to the DAQ, shows that resonator thermal noise dominates the noise budget at temperatures down to 100 mK. The measurements also confirm proper mode thermalization and negligible SQUID backaction. Strain sensitivities of 1–10 × 10⁻²¹ Hz⁻¹ᐟ² are obtained for resonant frequencies between 5 and 20 MHz. Equipped with three resonators and synchronized to an absolute global time reference for multi-site coincidence searches, the antenna is currently acquiring data in a pilot science run. A preliminary analysis of the data collected so far will be presented, together with the current performance of the detector.

Speaker: Leonardo Mariani (Bicocca)

09:25 → 10:05 Plenary Talk

09:25 Searching for Dark Matter at meV Energy Scales: New Techniques and New Challenges

Over the past few decades, searches for ‘classical’ WIMPS at masses in the 10 GeV - 1 TeV regime have matured and ruled out a broad set of supersymmetric models. Along with mature concepts for reaching the neutrino floor in this mass range, significant progress has been made in understanding how we closed the mass gap between the younger set of axion experiments and the conventional particle-like dark matter searches. In this talk, I will explore what it looks like to search for dark matter in this mass gap - roughly between 1 meV and 1 eV of absorption or scattering energy - and what some of the theoretical and experimental challenges are. I will also cover recent work towards sub-eV thresholds and the new backgrounds being discovered by these pathfinding experiments.

Speaker: Dr Noah Kurinsky (SLAC National Accelerator Laboratory - Stanford University)

10:05 → 10:30 Coffee Break

10:30 → 12:00 Friday Morning Session

10:30 New Perspectives on the QCD Axion

I will describe recent new perspectives on the QCD axion that go beyond the minimal picture, including the origin of the axion’s fundamental scale, how the underlying symmetry can be protected from quantum gravity, and mechanisms that modify the axion mass while still solving the strong CP problem. Together, these ideas can significantly redirect experimental search strategies and open qualitatively new possibilities for axion cosmology in the early universe

Speaker: Prof. Tony Gherghetta (University of Minnesota)

10:50 New physics searches at the NA62 experiment

The NA62 experiment at CERN is designed to measure the highly-suppressed decay $K^{+} \to \pi^{+}\nu\bar{\nu}$ and has collected a large sample of $K^+$ decays in flight during Run 1 (2016--2018) and Run 2 (2021--2026). Searches for the decay $K^{+}\rightarrow\pi^{+}X$ using data from 2016--2022, set upper limits on the branching ratio at the $10^{-11}$ level, constraining a broad range of New Physics scenarios, including Dark Photon, Scalars and Axion-Like Particles. The NA62 experiment at CERN has also the capability to collect data in a beam-dump mode, where 400 GeV protons are dumped on an absorber. In this configuration, New Physics particles may be produced in the absorber and decay in an instrumented volume beginning approximately 80 m downstream of the dump. Preliminary results from a search for Heavy-Neutral leptons decaying in flight to semi-leptonic final states are reported, based on an analysis of a sample of $6.2 \times 10^{17}$ protons on dump collected in 2021, 2023, and 2024.

Speaker: Gianluca Lamanna

11:10 Capture and Thermalisation of Dark Matter in Stars

The capture of dark matter in stars provides a cosmic laboratory in which to study the nature of dark matter particles and their interactions under extreme conditions. We discuss the capture of dark matter in neutron stars and white dwarfs, and the heating caused by the subsequent thermalisation and annihilation of that dark matter. We find that most of the dark matter’s kinetic energy is rapidly deposited in the star. Moreover, capture-annihilation equilibrium, and hence maximal annihilation heating, can typically be achieved without complete thermalisation of the captured dark matter. Comparing projected sensitivities with limits from direct detection experiments, we find that neutron stars and white dwarfs provide a possible means to probe dark matter interactions that would be difficult or impossible to observe in experiments on Earth.

Speaker: Prof. Nicole Bell (The University of Melbourne)

11:25 Direct Dark Matter Detection with the DarkSide-20k Liquid Argon Time Projection Chamber at LNGS

Weakly Interacting Massive Particles (WIMPs) are considered one of the most promising candidates for dark matter (DM) and could potentially be detected through their interactions with standard model particles.
The DarkSide program has pioneered the development of two-phase argon time projection chambers (TPCs) for direct DM searches, employing low-radioactivity argon extracted from underground reservoirs (UAr). The first experiment in the program, DarkSide-50, operated with a 50 kg UAr target and achieved world-leading sensitivity to low-mass WIMP candidates. The next phase of the program, the DarkSide-20k experiment, is currently under construction at the Laboratori Nazionali del Gran Sasso (LNGS). It will feature a 50-tonne active (20-tonne fiducial) UAr target instrumented as a two-phase TPC, incorporating a novel acrylic-based design and custom-developed cryogenic silicon photomultiplier (SiPM) arrays for efficient detection of argon scintillation light. The TPC will be enclosed within an active UAr neutron veto housed in the same vessel, which is itself surrounded by a larger atmospheric-argon veto designed to tag cosmogenic backgrounds and provide additional passive shielding.
This talk will present an overview of the DarkSide-20k detector design and its current construction status, and will conclude with a discussion of its projected physics reach.

Speaker: Paolo Salomone (The University of Chicago)

11:40 Liquid He tuning of dark matter axion haloscopes

Haloscopes are sensitive detectors used for dark matter axion search in the microwave energy range. They rely on the axion to photon conversion in a static magnetic field, and its amplification by resonance with a cavity electromagnetic mode. While simple cylinder cavities working below 1 GHz can provide large volume detectors of typically a hundred liters or more (GrAHal-CAPP), searches at higher frequencies are plagued by the decrease of the cavity volume, hence of the detector sensitivity. Several strategies can be used to increase the mode frequency without a detrimental loss of volume, like using multiple (ADMX), meta-material filled (ALPHA) or dielectric (MADMAX) cavities. In each case the mode frequency tuning, necessary to scan broad axion mass ranges, is challenging.
In this contribution we report on the investigation of mode tuning by filling a cavity with liquid He at 4K. Applied to a simple cylinder cavity with its TM010 mode resonating close to 6 GHz, the dielectric constant of the liquid allows to tune the mode frequency over 120 MHz. We simulate and measure the mode localization induced by the non-homogeneity of the dielectric constant in the cavity during the filling. We show that a very good mode stability and controlled slow filling can be achieved. As an illustration, the results of an axion search in the 6,23-6,33 GHz range are presented.
Further simulations showed mode localization can be mitigated thanks to a conical cavity shape. This was applied to a more complex cavity design doubling TM010 frequency (up to 13 GHz), to be tuned by liquid helium filling. Experimental tests conducted on such a cavity are discussed.

Speaker: Arthur Talarmin (CNRS - Institut Néel)

12:00 → 13:00 Farewell Lunch

13:00 → 13:40 Optional Lab Tour of the QDM Lab