Quadrature phase shift keying coherent state discrimination via a hybrid receiver

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

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


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
Article number083009
JournalNew Journal of Physics
Publication statusPublished - 2012 Aug
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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