Performance of Gaussian encodings for classical communication on correlated quantum phase-noise channels

Marco Fanizza, Matteo Rosati, Michalis Skotiniotis, John Calsamiglia, Vittorio Giovannetti

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We study the problem of transmitting classical information on a quantum channel in the absence of a shared phase reference. This problem is relevant for long-distance communications in free space and optical fiber, where phase noise is typically considered as a limiting factor. Previous analyses considered phase noise that acts independently on each communication mode, thus completely decohering successive signals and making it impossible to establish a phase reference. In the present work we analyze instead the realistic case in which the phase reference is lost only after m uses of the transmission line, due to a finite decoherence time. In this setting, focusing on the simplest case m = 2, we analyze two communication strategies using coherent states of the electromagnetic field and show that it is not beneficial to employ the total energy to establish a reference frame but rather to spread out the energy on all the modes and directly transmit information using their relative degrees of freedom.

Original languageEnglish
Pages (from-to)1830-1834
Number of pages5
JournalIEEE International Symposium on Information Theory - Proceedings
DOIs
Publication statusPublished - Jun 2020

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