Josef Schriefl et al 2006 New J. Phys. 8 1 doi:10.1088/1367-2630/8/1/001
Decoherence from ensembles of two-level fluctuators
Focus on Solid State Quantum InformationJosef Schriefl1, Yuriy Makhlin2, Alexander Shnirman1 and Gerd Schön1
Show affiliationsPart of Focus on Solid State Quantum Information
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 analyse the self-averaging properties of the results.
- PACS
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03.65.Yz Decoherence; open systems; quantum statistical methods
42.50.Ar Photon statistics and coherence theory
02.50.Ng Distribution theory and Monte Carlo studies
42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps
- MSC
- Subjects
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Optics, quantum optics and lasers
- Dates
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Issue 1 (January 2006)
Received 21 October 2005
Published 20 January 2006
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Decoherence from ensembles of two-level fluctuators
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