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arXiv 1202.0816cond-mat.supr-concond-mat.mes-hall
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通过相关电导率涨落测量超导谐振器中微波诱导的过剩准粒子

Microwave-induced excess quasiparticles in superconducting resonators measured through correlated conductivity fluctuations

P. J. de Visser, J. J. A. Baselmans, S. J. C. Yates, P. Diener, A. Endo, T. M. Klapwijk

摘要:

我们测量了铝超导微波谐振腔中的准粒子数和寿命。当微波功率降低6 dB时,160 mK以下的过剩准粒子数从72减少到17 $μ$ m $^{-3}$.准粒子的寿命相应地增加从1.4到3.5毫秒。这些属性的超导体的测量通过光谱的相关波动的准粒子系统和冷凝物的超导体,这显示在谐振器的振幅和相位分别。由于不相关的噪声源消失了,超导体中的涨落可以用接近真空噪声的灵敏度来研究。

英文摘要:

We have measured the number of quasiparticles and their lifetime in aluminium superconducting microwave resonators. The number of excess quasiparticles below 160 mK decreases from 72 to 17 $μ$m$^{-3}$ with a 6 dB decrease of the microwave power. The quasiparticle lifetime increases accordingly from 1.4 to 3.5 ms. These properties of the superconductor were measured through the spectrum of correlated fluctuations in the quasiparticle system and condensate of the superconductor, which show up in the resonator amplitude and phase respectively. Because uncorrelated noise sources vanish, fluctuations in the superconductor can be studied with a sensitivity close to the vacuum noise.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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