Single-Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions
Single-Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions
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DOI：
10.1103/physrevlett.112.047002
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发表时间：
2014-01-29
影响因子：
8.6
通讯作者：
Siddiqi, I.
中科院分区：
文献类型：
--
作者：
Levenson-Falk, E. M.;Kos, F.;Siddiqi, I.
我们展示了高品质因数超导谐振器的微波测量，该谐振器在由片上电容器分流的环路中包含两个铝纳米桥约瑟夫森结。捕获的准粒子 (QP) 会改变共振频率，使我们能够探测捕获的 QP 数量和能量分布，并量化它们的寿命。我们发现被捕获的 QP 群体服从高于 75 mK 的吉布斯分布，具有非泊松捕获统计。我们的结果与 Andreev 束缚态传输模型定量一致，并展示了量化片上 QP 群体并验证低温环境中缓解策略的实用方法。
We present microwave measurements of a high quality factor superconducting resonator incorporating two aluminum nanobridge Josephson junctions in a loop shunted by an on-chip capacitor. Trapped quasiparticles (QPs) shift the resonant frequency, allowing us to probe the trapped QP number and energy distribution and to quantify their lifetimes. We find that the trapped QP population obeys a Gibbs distribution above 75 mK, with non-Poissonian trapping statistics. Our results are in quantitative agreement with the Andreev bound state model of transport, and demonstrate a practical means to quantify on-chip QP populations and validate mitigation strategies in a cryogenic environment.