Spin Qubit Relaxation in a Moving Quantum Dot
Mesoscale and Nanoscale Physics
2013-08-12 v3 Quantum Physics
Abstract
Long-range quantum communication for spin qubits is an important open problem. Here we study decoherence of an electron spin qubit that is being transported in a moving quantum dot. We focus on spin decoherence due to spin-orbit interaction and a random electric potential. We find that at the lowest order, the motion induces longitudinal spin relaxation, with a rate linear in the dot velocity. Our calculated spin relaxation time ranges from sub s in GaAs to above ms in Si, making this relaxation a significant decoherence channel. Our results also give clear indications on how to reduce the decoherence effect of electron motion.
Cite
@article{arxiv.1208.1284,
title = {Spin Qubit Relaxation in a Moving Quantum Dot},
author = {Peihao Huang and Xuedong Hu},
journal= {arXiv preprint arXiv:1208.1284},
year = {2013}
}
Comments
7 pages and 3 figures