Generation of 8.3 dB continuous variable quantum entanglement at a telecommunication wavelength of 1550 nm
Feng Jin-Xia, Zhenju Wan, Yuanji Li, Zhang Kuanshou · Laser Physics Letters · 2017
Abstract Continuous variable quantum entanglement at a telecommunication wavelength of 1550 nm is experimentally generated using a single nondegenerate optical parametric amplifier based on a type-II periodically poled KTiOPO 4 crystal. The triply resonant of the nondegenerate optical parametric amplifier is adjusted by tuning the crystal temperature and tilting the orientation of the crystal in the optical cavity. Einstein–Podolsky–Rosen-entangled beams with quantum correlations of 8.3 dB for both the amplitude and phase quadratures are experimentally generated. This system can be used for continuous variable fibre-based quantum communication.