Sub-shot-noise-limited fiber-optic quantum receiver
arXiv:1911.08932 · doi:10.1103/PhysRevA.101.032306
Abstract
We experimentally demonstrate a quantum receiver based on Kennedy scheme for discrimination between two phase-modulated weak coherent states. The receiver is assembled entirely from the standard fiber-optic elements and operates at the conventional telecom wavelength 1.55 microns. 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 two times below the shot-noise limit.
References in corpus (7)
- Superconducting nanowire single-photon detectors: physics and applications
- Discrimination of the binary coherent signal: Gaussian-operation limit and simple non-Gaussian near-optimal receivers
- Demonstration of near-Optimal Discrimination of Optical Coherent States
- Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector
- Superconducting single-photon detectors with saturated dependence of quantum efficiency vs. bias current
- Optimized communication strategies with binary coherent states over phase noise channels
- A robust quantum receiver for phase shift keyed signals