Josephson microwave photon detector operating at 0.7 K

• URL: http://arxiv.org/abs/2405.04426v2
• Date: Sat, 01 Feb 2025 09:30:29 GMT
• Title: Josephson microwave photon detector operating at 0.7 K
• Authors: Dmitry A. Ladeynov, Andrey L. Pankratov, Leonid S. Revin, Anna V. Gordeeva, Alexander V. Chiginev, Sergey A. Razov, Evgeny V. Ilichev,
• Abstract summary: threshold detectors based on Al Josephson junctions with critical currents below 100 nA can be exploited for microwave photon detection. We demonstrate a detection of two- and one-photon energies at 5 GHz with 90% and 15% efficiency and dark count time of about 0.1 s and 0.01 s, respectively.
• Score: 36.136619420474766
• License:
• Abstract: We predict that the threshold detectors based on Al Josephson junctions, with critical currents below 100 nA, exhibiting a phase diffusion regime, can be exploited for the microwave photon detection both at 17 mK and 700 mK. We demonstrate a detection of two- and one-photon energies at 5 GHz with 90% and 15% efficiency and dark count time of about 0.1 s and 0.01 s, respectively. The observed weak temperature dependence of the detector's performance in the sub-kelvin range fully confirms its phase-diffusion mode of operation. On the other hand, these results show that inevitable thermal fluctuations are not the main source of the detector noise. Consequently, there is still a room to optimize the detector's performance. These results are important for axion search experiments in the range of 5-25 GHz (20-100 $\mu$eV).

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