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Relaxation of Josephson qubits due to strong coupling to two-level systems

Source: Phys. Rev. B 80, 134517 (2009); doi:10.1103/PhysRevB.80.134517

Published 22 October 2009

KEYWORDS and PACS
Keywords
PACS
  • 85.25.Cp
    Josephson devices
  • 71.55.-i
    Impurity and defect levels
  • 03.65.Yz
    Decoherence; open systems; quantum statistical methods
  • YEAR: 2009
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
Clemens Müller and Alexander Shnirman
Institut für Theorie der Kondensierten Materie and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe, D-76128 Karlsruhe, Germany

Yuriy Makhlin
Landau Institute for Theoretical Physics, Kosygin Street 2, 119334 Moscow, Russia
We investigate the energy relaxation (T1) process of a qubit coupled to a bath of dissipative two-level fluctuators (TLFs). We consider the fluctuators strongly coupled to the qubit both in the limit of spectrally sparse single TLFs as well as in the limit of spectrally dense TLFs. We conclude that the avoided level crossings, usually attributed to very strongly coupled single TLFs, could also be caused by many weakly coupled spectrally dense fluctuators. ©2009 The American Physical Society
History: Received 19 May 2009; revised 29 September 2009; published 22 October 2009
Permalink: http://link.aps.org/abstract/PRB/v80/e134517
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