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arXiv 2104.14211cond-mat.mes-hallcond-mat.supr-con
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阻容分流约瑟夫森结动力学中的量子涨落和热涨落

Quantum and thermal fluctuations in the dynamics of a resistively and capacitively shunted Josephson junction

Koichiro Furutani, Luca Salasnich

摘要:

我们从理论上研究了相位和电压的相关动力学,其中包括确定性的贡献和随机波动,下产生的电流噪声的电阻,包括热和量子涨落在一个电阻和电容分流约瑟夫森结。外部电流被发现转移和加强的相位和电压的确定性的贡献。除了外部电流的影响,我们观察到的相位和电压的自相关函数,其中包括由于电流噪声的方差,在长时间限制的有限值的松弛。特别是,我们发现,渐近相关依赖于电阻作为量子效应的后果。我们还发现,在较高的温度下,热波动占主导地位的量子的相干性的早期衰减。这些理论预测可以在未来的实验中得到验证。

英文摘要:

We theoretically investigate the phase and voltage correlation dynamics, which includes both the deterministic contribution and stochastic fluctuations, under a current noise generated by a resistor including thermal and quantum fluctuations in a resistively and capacitively shunted Josephson junction. An external current is found to shift and intensify the deterministic contributions in phase and voltage. In addition to effects of external current, we observe the relaxation of autocorrelation functions of phase and voltage, which includes the variances due to the current noise, to finite values in the long-time limit. In particular, we find that the asymptotic correlations depend on the resistance as a consequence of quantum effects. We also find an earlier decay of coherence at a higher temperature in which thermal fluctuations dominate over quantum ones. These theoretical predictions can be tested in the next future experiments.

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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