Low-Temperature Decoherence of Qubit Coupled to Background Charges

Details Low-Temperature Decoherence of Qubit Coupled to Background Charges Low-Temperature Decoherence of Qubit Coupled to Background Charges

2004-12-14

arxiv.org/abs/cond-mat/0412377v2

Phys. Rev. B 72, 060509(R) (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Both figures are changed to illustrate a more generic case of impurity states spread in wide interval of energies. Some change

Scientific paper

10.1103/PhysRevB.72.060509

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 ${\Gamma}$ 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 ($\gg T$) may essentially contribute to ${\Gamma}$.

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