Volume 69, Number 2, January 2005
|Page(s)||156 - 162|
|Published online||15 December 2004|
Nonstationary dephasing of two-level systems
CNRS-Laboratoire de Physique de l'École Normale Supérieure de Lyon 46 Allée d'Italie, 69007 Lyon, France
2 Institut für Theoretische Festkörperphysik, Universität Karlsruhe 76128 Karlsruhe, Germany
Accepted: 5 November 2004
We investigate the influence of nonstationary noise, produced by interacting defects, on a quantum two-level system. Adopting a simple phenomenological model for this noise we describe exactly the corresponding dephasing in various regimes. The nonstationarity and pronounced non-Gaussian features of this noise induce new anomalous dephasing scenarii. Beyond a history-dependent critical coupling strength, the dephasing time exhibits a strong dependence on the age of the noise and the decay of coherence is not exponential.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 73.23.-b – Electronic transport in mesoscopic systems
© EDP Sciences, 2005
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