Quasiparticle relaxation of superconducting qubits in the presence of flux

Catelani, G. and Koch, J. and Frunzio, L. and Schoelkopf, R. J. and Devoret, Michel H. and Glazman, Leonid (2011) Quasiparticle relaxation of superconducting qubits in the presence of flux. Physical review letters, 106 (7): 077002. ISSN 0031-9007

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Additional Information:
© 2011 American Physical Society
Uncontrolled Keywords:
?? physicsphysics and astronomy(all)qc physicsdiscipline-based research ??
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Deposited On:
19 Sep 2012 09:25
Last Modified:
10 Dec 2023 01:37