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Discrimination of coherent states beyond the standard quantum limit (SQL) isan important tasknot only for quantum information processing but also foroptical coherent communication. In orderto optimize long distance optical fibernetworks, it is of practical importance to develop a quantumreceiver beatingthe SQL and approaching the quantum bound at telecom wavelength. In thispaper,we experimentally demonstrate a receiver beating the conventional SQL attelecom wavelength. Ourreceiver is composed of a displacement operation, asingle photon counter and a real time adaptivefeedback operation. By using ahigh performance single photon detector operating at the telecomwavelength, weachieve a discrimination error beyond the SQL. The demonstration in thetelecomband provides the first step important towards quantum and classicalcommunication beyond theSQL using a coherent state alphabet, and we envisionthat the technology can be used for long-distance quantum key distribution,effective quantum state preparation and quantum estimation.

Experimental demonstration of a quantum receiver beating the standard quantum limit at the telecom wavelength