Decoherence processes in a current biased dc SQUID

被引：19

作者：

Claudon, J. ^{[1
]}

Fay, A. ^{[1
]}

Levy, L. P. ^{[1
]}

Buisson, O. ^{[1
]}

机构：

[1] Univ Grenoble 1, CNRS, CRTBT, LCMI, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.73.180502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A current biased dc superconducting quantum interference device behaves as an anharmonic quantum oscillator controlled by a bias current and an applied magnetic flux. We consider here its two level limit consisting of the two lower energy states parallel to 0 > and parallel to 1 >. We have measured energy relaxation times and microwave absorption for different bias currents and fluxes in the low microwave power limit. Decoherence times are extracted. The low frequency flux and current noise have been measured independently by analyzing the probability of current switching from the superconducting to the finite voltage state, as a function of applied flux. The high frequency part of the current noise is derived from the electromagnetic environment of the circuit. The decoherence of this quantum circuit can be fully accounted for by these current and flux noise sources.

引用

页数：4

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