Quantum fluctuations in Josephson junction comparators

被引：25

作者：

Walls, TJ ^{[1
]}

Filippov, TV ^{[1
]}

Likharev, KK ^{[1
]}

机构：

[1] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11974 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.89.217004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 DeltaI(x) of Josephson-junction balanced comparators. The calculated temperature dependence of DeltaI(x) 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/cm(2), without any fitting parameters.

引用

页码：217004 / 217004

页数：4

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