Quasiparticle relaxation of superconducting qubits in the presence of flux

G. Catelani*, J. Koch, L. Frunzio, R. J. Schoelkopf, M. H. Devoret, L. I. Glazman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

111 Scopus citations


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.

Original languageEnglish (US)
Article number077002
JournalPhysical review letters
Issue number7
StatePublished - Feb 16 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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