Mutual information of optical communication in phase-conjugating Gaussian channels

Clemens Schäfermeier, Ulrik L. Andersen

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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.

Original languageEnglish
Article number032313
Number of pages5
JournalPhysical Review A
Issue number3
Publication statusPublished - 2018

Bibliographical note

Accepted Author manuscript (arxiv!)


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