Tsinghua University,University of Science and Technology of China,University of Science and Technology of China,University of Science and Technology of China,University of Science and Technology of China
An integrated miniaturized portable entanglement source with high-brightness and high-stability has been designed using quasi-phase matching and Sagnac loop structure. Based on parametric down conversion process of PPKTP crystal, the entanglement source has the brightness of 13.8Mcps, the polarization contrast better than 98%, the tangle of 0.9357, and the jitter of counts rate caused by temperature variation and mechanical vibration less than 5%. The system has been successfully and effectively applied to the field test of 100km quantum entanglement distribution and lower-limit measurement of association speed under continuous running, which provides a good trial basis for further realizing the spatial entanglement source load.
ZHOU Fei, CAO Yuan, YIN Juan, REN Ji-Gang, PENG Cheng-Zhi. Integrated and portable entanglement source used for quantum communication over 100 kilometers[J]. Journal of Infrared and Millimeter Waves,2015,34(2):224~229Copy