Mutual information of optical communication in phase-conjugating Gaussian channels

Journal article (2018)

Authors

C. Schäfermeier Technical University of Denmark, QN/Groeblacher Lab - AS , Kavli institute of nanoscience Delft
U.L. Andersen Technical University of Denmark
Research Group
QN/Groeblacher Lab (AS) (TU Delft)
Copyright: © 2018 C. Schäfermeier, Ulrik L. Andersen
DOI
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https://doi.org/10.1103/PhysRevA.97.032313
More Info
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Published Date

2018

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Groeblacher Lab

Abstract

In all practical communication channels, the code word consists of Gaussian states and the measurement strategy is often a Gaussian detector such as homodyning or heterodyning. We investigate the communication performance using a phase-conjugated alphabet and joint Gaussian detection in a phase-insensitive amplifying channel. We find that a communication scheme consisting of a phase-conjugating alphabet of coherent states and a joint detection strategy significantly outperforms a standard coherent-state strategy based in individual detection. Moreover, we show that the performance can be further enhanced by using entanglement and that the performance is completely independent of the gain of the phase-insensitively amplifying channel.