A simple quantum channel having superadditivity of channel capacity
Quantum Physics
2009-10-30 v1
Abstract
When classical information is sent through a quantum channel of nonorthogonal states, there is a possibility that transmittable classical information exceeds a channel capacity in a single use of the initial channel by extending it into multi-product channel. In this paper, it is shown that this remarkable feature of a quantum channel, so-called superadditivity, appears even in as low as the third extended coding of the simplest binary input channel. A physical implementation of this channel is indicated based on cavity QED techniques.
Cite
@article{arxiv.quant-ph/9705043,
title = {A simple quantum channel having superadditivity of channel capacity},
author = {Masahide Sasaki and Kentaro Kato and Masayuki Izutsu and Osamu Hirota},
journal= {arXiv preprint arXiv:quant-ph/9705043},
year = {2009}
}
Comments
5 pages, LaTeX, 3 eps figures