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Relaxation of a qubit measured by a driven Duffing oscillator

Source: Phys. Rev. A 81, 022305 (2010); doi:10.1103/PhysRevA.81.022305

Published 5 February 2010

PACS
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 85.25.Cp
    Josephson devices
  • 05.45.-a
    Nonlinear dynamics and chaos
  • YEAR: 2010
PUBLICATION DATA
Publisher:
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I. Serban,1,2,3 M. I. Dykman,4 and F. K. Wilhelm1
1IQC and Deptartment of Physics and Astronomy, University of Waterloo, 200 University Avenue W, Waterloo, Ontario N2L 3G1, Canada
2Department Physik, Arnold-Sommerfeld-Center for Theoretical Physics, and Center for Nanoscience, Ludwig-Maximilians-Universität, Theresienstrasse 37, D-80333 München, Germany
3Instituut Lorentz, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, The Netherlands
4Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
We investigate the relaxation of a superconducting qubit for the case when its detector, the Josephson bifurcation amplifier, remains latched in one of its two (meta)stable states of forced vibrations. The qubit relaxation rates are different in different states. They can display strong dependence on the qubit frequency and resonant enhancement, which is due to quasienergy resonances. Coupling to the driven oscillator changes the effective temperature of the qubit. ©2010 The American Physical Society
History: Received 28 October 2009; published 5 February 2010
Permalink: http://link.aps.org/abstract/PRA/v81/e022305
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