Aging of dephasing by a classical intermittent noise
Résumé
We propose a phenomenological model for intermittent classical 1/f^mu noise and study the dephasing of a two level system ( e.g a qubit) in presence of this noise. Within this model, the evolution of the relative phase of the two level system is described as a continuous time random walk (CTRW). We find exact expressions for the dephasing factor in various regimes. The non-stationarity and pronounced non-Gaussian features of this noise induce new anomalous dephasing scenarii. In particular, for strong coupling between the two level system and the noise, the dephasing time depends explicitly on the age of the noise (aging).