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Noise fundamentally limits the capacity and reach in all communication links.In optical space communications, noise primarily originates from the detectionprocess and limits the signal fidelity. . Therefore, the receiver sensitivityplays a key role, dictating the minimum power needed to recover the informationtransmitted. The widely explored approach of using the pulse-positionmodulation format trades-off sensitivity against receiver bandwidth and thusdata-rate. Here we report on a novel, spectrally efficient, approach based on acoherent receiver with a near-noiseless phase-sensitive pre-amplifier operatingat room temperature and demonstrate a sensitivity of one photon-per-bit ofincident power at a data rate of 10 Gb/s. The results provide a path to futurehigh-capacity inter-satellite and deep space, and other free-spacecommunication links

One photon-per-bit receiver using near-noiseless phase-sensitive amplification