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Quantum enhanced receivers are endowed with resources to achieve highersensitivities than conventional technologies. For application in opticalcommunications, they provide improved discriminatory capabilities for multiplenon-orthogonal quantum states. In this work, we propose and experimentallydemonstrate a new decoding scheme for quadrature phase-shift encoded signals.Our receiver surpasses the standard quantum limit and outperforms allpreviously known non-adaptive detectors at low input powers. Unlike existingapproaches, the receiver only exploits linear optical elements and on-offphoto-detection. This circumvents the requirement for challenging feed-forwardoperations that limit communication transmission rates and can be readilyimplemented with current technology.

Quantum receiver for phase-shift keying at the single photon level