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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|
|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:||Click here to retrieve PDF version of paper (1MB)|