Josephson junctions as detectors for non‐Gaussian noise
Josephson junctions as detectors for non‐Gaussian noise
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DOI：
10.1002/andp.200710263
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发表时间：
2007-10
影响因子：
2.4
通讯作者：
B. Huard;H. Pothier;N. Birge;D. Estève;X. Waintal;J. Ankerhold
中科院分区：
文献类型：
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作者：
B. Huard;H. Pothier;N. Birge;D. Estève;X. Waintal;J. Ankerhold
电流的非高斯波动可以通过与噪声源一起放置在芯片上的约瑟夫森结来检测。我们提出了使用 NIS 结作为噪声源以及热逃逸区中的约瑟夫森结作为噪声检测器的初步测量结果。结果表明，约瑟夫森结不仅检测到平均噪声（表现为有效温度的增加），而且还检测到噪声不对称性。提出了存在非零第三累积量噪声时约瑟夫森结热逃逸的理论描述，以及当噪声源是具有泊松噪声的隧道结时的数值模拟。讨论了实验与理论之间的比较。
Non‐Gaussian fluctuations of the electrical current can be detected with a Josephson junction placed on‐chip with the noise source. We present preliminary measurements with an NIS junction as a noise source, and a Josephson junction in the thermal escape regime as a noise detector. It is shown that the Josephson junction detects not only the average noise, which manifests itself as an increased effective temperature, but also the noise asymmetry. A theoretical description of the thermal escape of a Josephson junction in presence of noise with a non‐zero third cumulant is presented, together with numerical simulations when the noise source is a tunnel junction with Poisson noise. Comparison between experiment and theory is discussed.