Speaker
Description
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)
| Primary Abstract Topic | Experiment: Axions and Wave-Like-DM |
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