Sub-shot-noise-limited fiber-optic quantum receiver
M. Shcherbatenko, M S Elezov, Gregory Goltsman, Denis Sych
Abstract
We experimentally demonstrate a quantum receiver based on the Kennedy scheme for discrimination between two phase-modulated weak coherent states. The receiver is assembled entirely from standard fiber-optic elements and operates at a conventional telecom wavelength of 1.55 $\ensuremath{\mu}\text{m}$. The local oscillator and the signal are transmitted through different optical fibers, and the displaced signal is measured with a high-efficiency superconducting nanowire single-photon detector. We show the discrimination error rate is two times below that of a shot-noise-limited receiver with the same system detection efficiency.
Topics & Concepts
Shot noiseOptical fiberNoise (video)Shot (pellet)QuantumQuantum noiseEnvironmental sciencePhysicsOpticsMaterials scienceComputer scienceQuantum mechanicsArtificial intelligenceDetectorImage (mathematics)MetallurgyQuantum Information and CryptographyAdvanced Fiber Laser TechnologiesPhotonic and Optical Devices