Additivity of decoherence measures for multiqubit quantum systems
Mesoscale and Nanoscale Physics
2010-10-12 v1 Chaotic Dynamics
Quantum Physics
Abstract
We introduce new measures of decoherence appropriate for evaluation of quantum computing designs. Environment-induced deviation of a quantum system's evolution from controlled dynamics is quantified by a single numerical measure. This measure is defined as a maximal norm of the density matrix deviation. We establish the property of additivity: in the regime of the onset of decoherence, the sum of the individual qubit error measures provides an estimate of the error for a several-qubit system. This property is illustrated by exact calculations for a spin-boson model.
Cite
@article{arxiv.cond-mat/0309685,
title = {Additivity of decoherence measures for multiqubit quantum systems},
author = {Leonid Fedichkin and Arkady Fedorov and Vladimir Privman},
journal= {arXiv preprint arXiv:cond-mat/0309685},
year = {2010}
}
Comments
4 pages, 1 figure