2012/04/30 by Christian R. Müller, C. Müller, Mario A. Usuga +6 · 6 citations
Computer Science · Engineering · Physics and Astronomy · #Amplitude and phase-shift keying #Bit error rate #Coherent states #Electronic engineering #Keying #Optical Network Technologies #Optics #Phase (matter) #Phase-shift keying #Physics #Quadrature (astronomy) #Quantum #Quantum Information and Cryptography #Quantum mechanics #Quantum optics and atomic interactions #Telecommunications #quant-ph
paper · pdf · doi:10.1088/1367-2630/14/8/083009
published as C R Müller et al 2012 New J. Phys. 14 083009
arxiv created 2012/06/26 · openalex publication_date 2012/08/10 · arxiv updated 2012/08/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.