Nonequilibrium quasiparticles are ubiquitous in superconducting electronics. These quasiparticles can trap in the internal Andreev bound states of a phase-biased Josephson junction, providing a mechanism for studying their presence and behavior. We characterize a quasiparticle trapping detector device based on a two junction aluminum nanobridge superconducting quantum interference device incorporated into a transmission line resonator. When the device is flux-biased, distinct resonant frequencies develop depending on the trapped quasiparticle number. We demonstrate continuous detection of up to 3 trapped quasiparticles, with detection of a trapped quasiparticle with a signal-to-noise ratio of 27 in 5 μs. We describe initial measurements of quasiparticle behavior and discuss the possible optimization and application of such detector devices.

中文翻译：

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铝纳米桥约瑟夫森结中准粒子俘获的连续实时检测

非平衡准粒子在超导电子学中无处不在。这些准粒子可以困在相位偏置约瑟夫森结的内部安德烈夫束缚态中，为研究它们的存在和行为提供了一种机制。我们表征了一种准粒子俘获探测器装置，该装置基于并入传输线谐振器的双结铝纳米桥超导量子干涉装置。当器件为磁通偏置时，根据捕获的准粒子数会产生不同的共振频率。我们展示了对多达 3 个被困准粒子的连续检测，检测到信噪比为 27 in 5 μ的被困准粒子 s。我们描述了准粒子行为的初始测量，并讨论了此类探测器设备的可能优化和应用。