Phys. Rev. B 72, 060509(R) (2005) [4 pages]Low-temperature decoherence of qubit coupled to background charges
We have found an exact expression for the decoherence rate of a Josephson charge qubit coupled to fluctuating background charges. At low temperatures T the decoherence rate Γ is linear in T while at high temperatures it saturates in agreement with a known classical solution which, however, reached at surprisingly high T. In contrast to the classical picture, impurity states spread in a wide interval of energies (⪢T) may essentially contribute to Γ. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.060509
DOI:
10.1103/PhysRevB.72.060509
PACS:
74.78.Na, 73.21.−b, 03.65.Yz
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