Structured optical receivers to attain superadditive capacity and the Holevo limit
Abstract
When classical information is sent over a quantum channel, attaining the ultimate limit to channel capacity requires the receiver to make joint measurements over long codeword blocks. For a pure-state channel, we construct a receiver that can attain the ultimate capacity by applying a single-shot unitary transformation on the received quantum codeword followed by simultaneous (but separable) projective measurements on the single-modulation-symbol state spaces. We study the ultimate limits of photon-information-efficient communications on a lossy bosonic channel. Based on our general results for the pure-state quantum channel, we show some of the first concrete examples of codes and structured joint-detection optical receivers that can achieve fundamentally higher (superadditive) channel capacity than conventional receivers that detect each modulation symbol individually.
Keywords
Cite
@article{arxiv.1101.1550,
title = {Structured optical receivers to attain superadditive capacity and the Holevo limit},
author = {Saikat Guha},
journal= {arXiv preprint arXiv:1101.1550},
year = {2015}
}
Comments
4 pages, 4 figures