Charge qubit dynamics in a double quantum dot coupled to phonons
Mesoscale and Nanoscale Physics
2007-05-23 v1
Abstract
The dynamics of charge qubit in a double quantum dot coupled to phonons is investigated theoretically in terms of a perturbation treatment based on a unitary transformation. The dynamical tunneling current is obtained explicitly. The result is compared with the standard perturbation theory at Born-Markov approximation. The decoherence induced by acoustic phonons is analyzed at length. It is shown that the contribution from deformation potential coupling is comparable to that from piezoelectric coupling in small dot size and large tunneling rate case. A possible decoupling mechanism is predicted.
Keywords
Cite
@article{arxiv.cond-mat/0412503,
title = {Charge qubit dynamics in a double quantum dot coupled to phonons},
author = {Zhuo-Jie Wu and Ka-Di Zhu and Xiao-Zhong Yuan and Yi-Wen Jiang and Hang Zheng},
journal= {arXiv preprint arXiv:cond-mat/0412503},
year = {2007}
}
Comments
8 pages, 6 figures