Phys. Rev. B 80, 134517 (2009) [10 pages]Relaxation of Josephson qubits due to strong coupling to two-level systemsReceived 19 May 2009; revised 29 September 2009; published 22 October 2009 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 URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.134517
DOI:
10.1103/PhysRevB.80.134517
PACS:
85.25.Cp, 71.55.−i, 03.65.Yz
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