2020 IEEE International Symposium
on Information Theory
21-26 June 2020 • Los Angeles, California, USA
| Paper ID | Q.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. | ||
Plan Ahead
2021 IEEE International Symposium on Information Theory
11-16 July 2021 | Melbourne, Victoria, Australia
