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arXiv 0901.2519cond-mat.mes-hall
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用约瑟夫森结探测非对称噪声

Asymmetric noise probed with a Josephson junction

Q. Le Masne, H. Pothier, Norman O. Birge, C. Urbina, D. Esteve

摘要:

使用约瑟夫森结测量通过隧道结的电流波动。电流噪声增加了约瑟夫森结的偏置电流,并影响其从超导支路的切换。该实验是在一个政权,其中切换是由热激活。噪声的方差导致有效温度升高,而第三累积量与其不对称特性相关,导致通过隧道结的电流的相反符号所观察到的开关速率的差异。测量结果与最近的理论预测进行了定量比较。

英文摘要:

Fluctuations of the current through a tunnel junction are measured using a Josephson junction. The current noise adds to the bias current of the Josephson junction and affects its switching out of the supercurrent branch. The experiment is carried out in a regime where switching is determined by thermal activation. The variance of the noise results in an elevated effective temperature, whereas the third cumulant, related to its asymmetric character, leads to a difference in the switching rates observed for opposite signs of the current through the tunnel junction. Measurements are compared quantitatively with recent theoretical predictions.

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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