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Quasiparticle relaxation of superconducting qubits in the presence of flux

Research output: Contribution to journalJournal article


  • G. Catelani
  • J. Koch
  • L. Frunzio
  • R. J. Schoelkopf
  • Michel H. Devoret
  • Leonid Glazman
Article number077002
Journal publication date16/02/2011
JournalPhysical Review Letters
Number of pages4
Original languageEnglish


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.

Bibliographic note

© 2011 American Physical Society