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Experimental demonstration of the near-quantum optimal receiver



Jabir Marakkarakath Vadakkepurayil, Ivan Burenkov, FNU Nur Fajar Rizqi Annafianto, Abdella Battou, Sergey Polyakov


We implement the cyclic quantum receiver based on the theoretical proposal of Roy Bondurant and demonstrate experimentally below the shot-noise limit (SNL) discrimination of quadrature phase-shift keying signals (PSK). We also experimentally test the receiver generalized for longer communication alphabet lengths and coherent frequency shift keying (CFSK) encoding. Using off-the-shelf components, we obtain state discrimination error rates that are 3 dB and 4.6 dB below the SNLs of ideal classical receivers for quadrature PSK and CFSK encodings, respectively. The receiver unconditionally surpasses the SNL for M=8 PSK and CFSK. This receiver can be used for the simple and robust practical implementation of quantum-enhanced optical communication.
OSA Continuum


Marakkarakath Vadakkepurayil, J. , Burenkov, I. , Nur Fajar Rizqi Annafianto, F. , Battou, A. and Polyakov, S. (2020), Experimental demonstration of the near-quantum optimal receiver, OSA Continuum, [online],, (Accessed July 16, 2024)


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Created November 19, 2020, Updated January 17, 2024