Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath
Mesoscale and Nanoscale Physics
2009-02-03 v2 Quantum Physics
Abstract
We investigate pure dephasing decoherence (free induction decay and spin echo) of a spin qubit interacting with a nuclear spin bath. While for infinite magnetic field B the only decoherence mechanism is spectral diffusion due to dipolar flip-flops of nuclear spins, with decreasing B the hyperfine-mediated interactions between the nuclear spins become important. We give a theory of decoherence due to these interactions which takes advantage of their long-range nature. For a thermal uncorrelated bath we show that our theory is applicable down to B~10 mT, allowing for comparison with recent experiments in GaAs quantum dots.
Cite
@article{arxiv.0809.0003,
title = {Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath},
author = {L. Cywinski and W. M. Witzel and S. Das Sarma},
journal= {arXiv preprint arXiv:0809.0003},
year = {2009}
}
Comments
Published version, new title suggested by the PRL editor