Quasiparticle Relaxation of Superconducting Qubits in the Presence of Flux

被引：128

作者：

Catelani, G. ^{[1
,2
]}

Koch, J. ^{[3
]}

Frunzio, L. ^{[1
,2
]}

Schoelkopf, R. J. ^{[1
,2
]}

Devoret, M. H. ^{[1
,2
]}

Glazman, L. I. ^{[1
,2
]}

机构：

[1] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[2] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA

[3] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 07期

基金：

美国国家科学基金会;

关键词：

PARITY-INDUCED SUPPRESSION;

D O I：

10.1103/PhysRevLett.106.077002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quasiparticle tunneling across a Josephson junction sets a limit for the lifetime of a superconducting qubit state. We develop a general theory of the corresponding decay rate in a qubit controlled by a magnetic flux. The flux affects quasiparticles tunneling amplitudes, thus making the decay rate flux-dependent. The theory is applicable for an arbitrary quasiparticle distribution. It provides estimates for the rates in practically important quantum circuits and also offers a new way of measuring the phase-dependent admittance of a Josephson junction.

引用

页数：4

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