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Publication Citation: M-ary state phase-shift keying discrimination below the homodyne limit

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Author(s): Francisco E. Becerra Chavez; Jingyun Fan; Gerald Baumgartner; Sergey V. Polyakov; Julius Goldhar; Jonathan Kosloski; Alan L. Migdall;
Title: M-ary state phase-shift keying discrimination below the homodyne limit
Published: December 22, 2011
Abstract: We investigate a strategy for M-ary discrimination of nonorthogonal phase states with error rates below the homodyne limit. This strategy uses feed forward to update a reference field and Signal nulling for the state discrimination. We experimentally analyze the receiver performance using postprocessing and a Bayesian strategy to emulate the feed-forward process. This analysis demonstrates that for a moderate system detection efficiency, it is possible to surpass the homodyne error limit for quadrature phase-shift keying (QPSK) signals using feed forward.
Citation: Physical Review A
Volume: 84
Pages: 9 pp.
Keywords: state discrimination; quantum information; quantum communication; single photon; quantum mechanics; single photon detection
Research Areas: Quantum Optics, Quantum Information, Single Photon Detectors, Quantum Devices, Physics, Quantum Communications, Quantum Information Technology
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)