Qubit protection in nuclear-spin quantum dot memories
Mesoscale and Nanoscale Physics
2009-07-03 v1
Abstract
We present a mechanism to protect quantum information stored in an ensemble of nuclear spins in a semiconductor quantum dot. When the dot is charged the nuclei interact with the spin of the excess electron through the hyperfine coupling. If this coupling is made off-resonant it leads to an energy gap between the collective storage states and all other states. We show that the energy gap protects the quantum memory from local spin-flip and spin-dephasing noise. Effects of non-perfect initial spin polarization and inhomogeneous hyperfine coupling are discussed.
Cite
@article{arxiv.0902.4566,
title = {Qubit protection in nuclear-spin quantum dot memories},
author = {Z. Kurucz and M. W. Sørensen and J. M. Taylor and M. D. Lukin and M. Fleischhauer},
journal= {arXiv preprint arXiv:0902.4566},
year = {2009}
}
Comments
5 pages, 3 figures