Nonstationary dephasing of two level systems

Details Nonstationary dephasing of two level systems Nonstationary dephasing of two level systems

2004-03-31

arxiv.org/abs/cond-mat/0403750v2

Europhysics Letters 69 (2005) 156

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1209/epl/i2004-10324-1

We investigate the influence of nonstationary 1/f^mu 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.

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