Distribution of continuous variable quantum entanglement at a telecommunication wavelength over 20 km of optical fiber
Jinxia Feng, Zhenju Wan, Yuanji Li, Kuanshou Zhang · Optics Letters · 2017
crystal. When one beam of the generated EPR-entangled beams is distributed over 20 km of single-mode fiber, 1.02 dB quantum entanglement can still be measured. The degradation of CV quantum entanglement in a noisy fiber channel is theoretically analyzed considering the effect of depolarized guided acoustic wave Brillouin scattering in optical fibers. The theoretical prediction is in good agreement with the experimental results.