Quantum data processing and error correction
Quantum Physics
2009-10-30 v1
Abstract
This paper investigates properties of noisy quantum information channels. We define a new quantity called {\em coherent information} which measures the amount of quantum information conveyed in the noisy channel. This quantity can never be increased by quantum information processing, and it yields a simple necessary and sufficient condition for the existence of perfect quantum error correction.
Cite
@article{arxiv.quant-ph/9604022,
title = {Quantum data processing and error correction},
author = {Benjamin Schumacher and M. A. Nielsen},
journal= {arXiv preprint arXiv:quant-ph/9604022},
year = {2009}
}
Comments
LaTeX, 20 pages