Quantum Fluctuations in Josephson Junction Comparators

Thomas J. Walls; Timur V. Filippov; Konstantin K. Likharev

doi:10.1103/PhysRevLett.89.217004

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Quantum Fluctuations in Josephson Junction Comparators

Thomas J. Walls, Timur V. Filippov, Konstantin K. Likharev

DOI 10.1103/PhysRevLett.89.217004 · Physical Review Letters

T1

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Abstract

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 ΔIx of Josephson-junction balanced comparators. The calculated temperature dependence of ΔIx 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown