The decoherence of a qubit due to a classical non-Gaussian noise with correlation time longer than the decoherence time is discussed for arbitrary working points of the qubit. A method is developed that allows an exact formula for the phase memory functional in the presence of independent random telegraph noise sources to be derived.
@article{arxiv.cond-mat/0603575,
title = {Decoherence of a qubit by non-Gaussian noise at an arbitrary working point},
author = {J. Bergli and Y. M. Galperin and B. L. Altshuler},
journal= {arXiv preprint arXiv:cond-mat/0603575},
year = {2009}
}