All-fiber telecom band energy-time entangled biphoton source
Yuting Liu, Junjie Xing, Zhiguang Xia, Runai Quan, Huibo Hong, Tao Liu, Shougang Zhang, Xiao Xiang, Ruifang Dong
Abstract
We report an all-fiber telecom-band energy-time entangled biphoton source with all physical elements integrated into a compact cabinet. At a pump power of 800 µW, the photon pairs generation rate reaches 6.9 MHz with the coincidence-to-accidental ratio (CAR) better than 1150. The long-term stability of the biphoton source is characterized by measuring the Hong–Ou–Mandel interference visibility and CAR within a continuous operation period of more than 10 h. Benefiting from the advantages of compact size, light weight, and high stability, this device provides a convenient resource for various field turnkey quantum communication and metrology applications.