Nonstationary dephasing of two level systems
Josef Schriefl, Maxime Clusel, David Carpentier, Pascal Degiovanni
Abstract
We investigate the influence of nonstationary 1/fmu 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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