Quadrature phase shift keying coherent state discrimination via a hybrid receiver

C. R. Müller, Mario A. Usuga Castaneda, C. Wittmann, M. Takeoka, Ch. Marquardt, U L Andersen, G. Leuchs

Research output: Contribution to journalJournal articleResearchpeer-review


We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying (QPSK) protocol. We show in theory that the performance of our hybrid scheme is superior to the standard scheme—heterodyne detection—for all signal amplitudes and underpin the predictions with our experimental results. Furthermore, our scheme provides hitherto the best performance in the domain of highly attenuated signals. The discrimination is composed of a quadrature measurement, a conditional displacement and a threshold detector.
Original languageEnglish
JournalNew Journal of Physics
Issue number8
Pages (from-to)083009
Publication statusPublished - 2012


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