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Paper IDQ.1.3
Paper Title Performance of Gaussian encodings for classical communication on correlated quantum phase-noise channels
Authors Marco Fanizza, NEST, Scuola Normale Superiore, Istituto Nanoscienze - CNR, Italy; Matteo Rosati, Michalis Skotiniotis, John Calsamiglia, Física Teòrica: Informació i Fenòmens Quàntics, Departament de Física, Universitat Autònoma de Barcelona, Spain; Vittorio Giovannetti, NEST, Scuola Normale Superiore, Istituto di Nanoscienze - CNR, Italy
Session Q.1: Quantum Communication
Presentation Lecture
Track Quantum Systems, Codes, and Information
Manuscript  Click here to download the manuscript
Virtual Presentation  Click here to watch in the Virtual Symposium
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 channel, 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.

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2021 IEEE International Symposium on Information Theory

11-16 July 2021 | Melbourne, Victoria, Australia

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