Decoherence from ensembles of two-level fluctuators

Details Decoherence from ensembles of two-level fluctuators Decoherence from ensembles of two-level fluctuators

2005-12-22

arxiv.org/abs/cond-mat/0512578v1

New J. Phys. 8, 1 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

accepted in New Journal of Physics

Scientific paper

10.1088/1367-2630/8/1/001

1/f noise, the major source of dephasing in Josephson qubits, may be produced by an ensemble of two-level systems. Depending on the statistical properties of their distribution, the noise distribution can be Gaussian or non-Gaussian. The latter situation is realized, for instance, when the distribution of coupling strengths has a slowly decaying power-law tail. In this regime questions of self-averaging and sample-to-sample fluctuations become crucial. We study the dephasing process for a class of distribution functions and analyze the self-averaging properties of the results.

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