Environment-Assisted Error Correction of Single-Qubit Phase Damping
Quantum Physics
2013-05-29 v1
Abstract
Open quantum system dynamics of random unitary type may in principle be fully undone. Closely following the scheme of environment-assisted error correction proposed by Gregoratti and Werner [M. Gregoratti and R. F. Werner, J. Mod. Opt. 50(6), 915-933 (2003)], we explicitly carry out all steps needed to invert a phase-damping error on a single qubit. Furthermore, we extend the scheme to a mixed-state environment. Surprisingly, we find cases for which the uncorrected state is closer to the desired state than any of the corrected ones.
Cite
@article{arxiv.1110.4806,
title = {Environment-Assisted Error Correction of Single-Qubit Phase Damping},
author = {Benjamin Trendelkamp-Schroer and Julius Helm and Walter T. Strunz},
journal= {arXiv preprint arXiv:1110.4806},
year = {2013}
}