26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

Session

AIP QST: Quantum sensing, estimation & entanglement

QST

9 Dec 2026, 11:00

Belinda Hutchinson Building (The University of Sydney )

399. Multiparameter Estimation in Asymmetric Atom Interferometers

Meghan Gossayn (Australian National University)

09/12/2026, 11:00

AIP | Quantum Science and Technology (QST)

Contributed Oral

Atom interferometers have emerged as a promising pathway for the development of compact, high-performance inertial sensors, and are now transitioning from controlled laboratory environments into robust, field-deployable devices. A critical challenge is the effect of imperfect interferometer closure due to environmental disturbances, such as rotations of the device, which reduce the visibility...

726. Impact of quantum noise on Ramsey spectroscopy

Diego Bernal-García (Griffith University)

09/12/2026, 11:15

AIP | Quantum Science and Technology (QST)

Contributed Oral

Ramsey spectroscopy is a cornerstone technique for precision frequency estimation, but its standard analysis assumes a classical noise environment that can be reset before each measurement. We investigate the impact of genuinely quantum noise on sequential Ramsey spectroscopy of a single probe qubit coupled to a bosonic bath through a purely dephasing interaction. Unlike a classical source, a...

643. Certifying high-dimensional entanglement via particle exchange symmetry

Jayden Webster (Quantum and Advanced Technologies Research Institute, Griffith University, Yuggera Country, Brisbane, QLD 4111, Australia)

09/12/2026, 11:30

AIP | Quantum Science and Technology (QST)

Contributed Oral

Photons have proven themselves to be an excellent choice for carrying quantum information. Storing information in the arrival time of photons, i.e. time-bin encoding, naturally enables the creation of high-dimensional states that are information dense and robust against noise. By coupling high-dimension time-bin encoding with entanglement, we can extend the application of these states into the...

357. Spin entanglement of two thermal atoms in an optical tweezer and its use for magnetic field sensing

Mikkel F. Andersen (University of Otago)

09/12/2026, 11:45

AIP | Quantum Science and Technology (QST)

Contributed Oral

Quantum entanglement can enable revolutionary technologies for faster computing and precise sensing. However, it is fragile and easily lost if the quantum system interacts with a thermal environment.
This talk will discuss how thermalization with hot degrees of freedom can drive a quantum system from an unentangled state into a long lived entangled one. In particular we study the spin...

471. Trade-offs and entanglement in quantum multiparameter estimation

Simon Yung (Australian National University)

09/12/2026, 12:00

AIP | Quantum Science and Technology (QST)

Invited talk

Quantum estimation theory provides the basis for quantum metrology. However, quantum multiparameter estimation is fundamentally limited by the uncertainty principle. This manifests as a trade-off between attainable estimation precisions, because the optimal measurements for each parameter are generally incompatible. Using quantum Cramér–Rao bounds, we analysed these trade-offs and compared...