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Experimental demonstration of the near-quantum optimal receiver

TitleExperimental demonstration of the near-quantum optimal receiver
Publication TypeJournal Article
Year of Publication2020
Authors, I.. A. Burenkov, F. R. N. Annafianto, A.. Battou, and
JournalOSA Continuum
Volume3
Pagination3324+
Date Publisheddec
ISSN2578-7519
Abstract

We implement the cyclic quantum receiver based on the theoretical proposal of Roy Bondurant and demonstrate experimentally below the shot-noise limit (SNL) discrimination of quadrature phase-shift keying signals (PSK). We also experimentally test the receiver generalized for longer communication alphabet lengths and coherent frequency shift keying (CFSK) encoding. Using off-the-shelf components, we obtain state discrimination error rates that are 3 dB and 4.6 dB below the SNLs of ideal classical receivers for quadrature PSK and CFSK encodings, respectively. The receiver unconditionally surpasses the SNL for M=8 PSK and CFSK. This receiver can be used for the simple and robust practical implementation of quantum-enhanced optical communication. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

DOI10.1364/OSAC.409200