Quantum fluctuations in Josephson junction comparators.
Quantum fluctuations in Josephson junction comparators.
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约瑟夫森结比较器中的量子涨落。
DOI：
10.1103/physrevlett.89.217004
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发表时间：
2002
影响因子：
8.6
通讯作者：
K. Likharev
中科院分区：
文献类型：
--
作者：
T. J. Walls;T. Filippov;K. Likharev
我们发展了一种计算量子涨落效应的方法，特别是在Caldeira-Leggett模型中，对于具有任意时间频率和任意温度的阻尼谐振子，在势曲率符号反转时发展的不确定区。该方法已应用于约瑟夫森结平衡比较器灰度区宽度的计算。对于临界电流密度分别为1.0和5.5kA/cm2的Nb三层比较器，在1.5~4.2K温度范围内的计算结果与实验数据基本一致，且没有任何拟合参数。
We have developed a method for calculation of quantum fluctuation effects, in particular, of the uncertainty zone developing at the potential curvature sign inversion, for a damped harmonic oscillator with arbitrary time dependence of frequency and for arbitrary temperature, within the Caldeira-Leggett model. The method has been applied to the calculation of the gray zone width Delta Ix of Josephson-junction balanced comparators. The calculated temperature dependence of Delta Ix in the range 1.5 to 4.2 K is in virtually perfect agreement with experimental data for Nb-trilayer comparators with critical current densities of 1.0 and 5.5 kA/cm2, without any fitting parameters.