Decoherence from ensembles of two-level fluctuators
Mesoscale and Nanoscale Physics
2007-05-23 v1
Abstract
1/f noise, the major source of dephasing in Josephson qubits, may be produced by an ensemble of two-level systems. Depending on the statistical properties of their distribution, the noise distribution can be Gaussian or non-Gaussian. The latter situation is realized, for instance, when the distribution of coupling strengths has a slowly decaying power-law tail. In this regime questions of self-averaging and sample-to-sample fluctuations become crucial. We study the dephasing process for a class of distribution functions and analyze the self-averaging properties of the results.
Cite
@article{arxiv.cond-mat/0512578,
title = {Decoherence from ensembles of two-level fluctuators},
author = {Josef Schriefl and Yuriy Makhlin and Alexander Shnirman and Gerd Schön},
journal= {arXiv preprint arXiv:cond-mat/0512578},
year = {2007}
}
Comments
accepted in New Journal of Physics