| Issue |
Europhys. Lett.
Volume 69, Number 2, January 2005
|
|
|---|---|---|
| Page(s) | 156 - 162 | |
| Section | General | |
| DOI | https://doi.org/10.1209/epl/i2004-10324-1 | |
| Published online | 15 December 2004 | |
Nonstationary dephasing of two-level systems
1
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
Received:
8
June
2004
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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