Quasiparticle Relaxation of Superconducting Qubits in the Presence of Flux

G. Catelani, J. Koch, L. Frunzio, R. J. Schoelkopf, M. H. Devoret, and L. I. Glazman
Phys. Rev. Lett. 106, 077002 – Published 16 February 2011

Abstract

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.

  • Received 28 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.077002

© 2011 American Physical Society

Authors & Affiliations

G. Catelani1, J. Koch2, L. Frunzio1, R. J. Schoelkopf1, M. H. Devoret1, and L. I. Glazman1

  • 1Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA
  • 2Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA

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Issue

Vol. 106, Iss. 7 — 18 February 2011

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