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

Journal Article · Thu Dec 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.062324· OSTI ID:22095584

Becerra, F. E.; Fan, J.; Polyakov, S. V.; Migdall, A. ^[1]; Baumgartner, G. ^[2]; Goldhar, J. ^[3]; Kosloski, J. T. ^[4]

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1. Joint Quantum Institute, Department of Physics, University of Maryland, and National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899 (United States)
2. Laboratory for Telecommunications Sciences, 8080 Greenmead Drive, College Park, Maryland 20740 (United States)
3. Department of Electrical and Computer Engineering, 2410 A.V. Williams Building, University of Maryland, College Park, Maryland 20742 (United States)
4. Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland 21218 (United States)

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 shows that for a moderate system detection efficiency, it is possible to surpass the homodyne error limit for quadrature phase-shift keying signals using feed forward.

• OSTI ID: 22095584
• Journal Information: Physical Review. A, Vol. 84, Issue 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DETECTION
EFFICIENCY
ERRORS
PERFORMANCE
PHASE SHIFT
QUADRATURES
QUANTUM MECHANICS
QUANTUM STATES
SIGNALS