Quantum noise in a current-biased Josephson junction
Quantum noise in a current-biased Josephson junction
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DOI：
10.1103/physrevb.67.184504
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发表时间：
2003-05-01
影响因子：
3.7
通讯作者：
Levinson, Y
中科院分区：
文献类型：
--
作者：
Levinson, Y
在电流偏置的约瑟夫森结，描述的RCSJ模型的量子涨落，被认为是。跨结的电压和相位的波动被假定为由分流电阻器中的平衡电流波动发起。这对应于足够低的温度，此时结本身中正常电流的波动可以忽略不计。我们使用量子朗之万方程的随机变量有关的非线性约瑟夫森振子的极限环。这允许超越微扰理论，并计算约瑟夫森辐射线的宽度。
Quantum fluctuations in a current-biased Josephson junction, described in terms of the RCSJ model, are considered. The fluctuations of the voltage and phase across the junction are assumed to be initiated by equilibrium current fluctuations in the shunting resistor. This corresponds to low enough temperatures, when fluctuations of the normal current in the junction itself can be neglected. We used the quantum Langevin equation in terms of random variables related to the limit cycle of the nonlinear Josephson oscillator. This allows to go beyond the perturbation theory and to calculate the widths of the Josephson radiation lines.