Decoherence by Correlated Noise and Quantum Error Correction
Quantum Physics
2007-05-23 v2 Mesoscale and Nanoscale Physics
Abstract
We study the decoherence of a quantum computer in an environment which is inherently correlated in time and space. We first derive the nonunitary time evolution of the computer and environment in the presence of a stabilizer error correction code, providing a general way to quantify decoherence for a quantum computer. The general theory is then applied to the spin-boson model. Our results demonstrate that effects of long-range correlations can be systematically reduced by small changes in the error correction codes.
Cite
@article{arxiv.quant-ph/0508228,
title = {Decoherence by Correlated Noise and Quantum Error Correction},
author = {E. Novais and Harold U. Baranger},
journal= {arXiv preprint arXiv:quant-ph/0508228},
year = {2007}
}
Comments
4 pages, 1 figure, Phys. Rev. Lett. in press