Phonon Decoherence of a Double Quantum Dot Charge Qubit
Mesoscale and Nanoscale Physics
2007-05-23 v2
Abstract
We study decoherence of a quantum dot charge qubit due to coupling to piezoelectric acoustic phonons in the Born-Markov approximation. After including appropriate form factors, we find that phonon decoherence rates are one to two orders of magnitude weaker than was previously predicted. We calculate the dependence of the Q-factor on lattice temperature, quantum dot size, and interdot coupling. Our results suggest that mechanisms other than phonon decoherence play a more significant role in current experimental setups.
Keywords
Cite
@article{arxiv.cond-mat/0412190,
title = {Phonon Decoherence of a Double Quantum Dot Charge Qubit},
author = {Serguei Vorojtsov and Eduardo R. Mucciolo and Harold U. Baranger},
journal= {arXiv preprint arXiv:cond-mat/0412190},
year = {2007}
}
Comments
RevTex, 7 pages, 5 figures. v2: appendix added, more details provided. Accepted for publication in PRB