PT Journal
AU Shcherbatenko, ML
   Elezov, MS
   Goltsman, GN
   Sych, DV
TI Sub-shot-noise-limited fiber-optic quantum receiver
SO Phys. Rev. A
JI Phys. Rev. A
PY 2020
BP 032306 (1 to 5)
VL 101
IS 3
DI 10.1103/PhysRevA.101.032306
DE SSPD mixer; SNSPD
AB 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 μm. 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.
ER