Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip
Guang-Tai Xue, Yun-Fei Niu, Xiaoyue Liu, Jia-Chen Duan, Wenjun Chen, Ying Pan, Kunpeng Jia, Xiaohan Wang, Hua-Ying Liu, Yong Zhang, Ping Xu, Gang Zhao, Xinlun Cai, Yan-Xiao Gong, Xiaopeng Hu, Zhenda Xie, Shining Zhu
Abstract
A high-flux entangled-photon source is a key resource for quantum optical study and application. Here, it is realized in a lithium niobate on isolator (LNOI) chip, with 2.79 \ifmmode\times\else\texttimes\fi{} ${10}^{11}$ Hz/mW photon-pair rate and 1.53 \ifmmode\times\else\texttimes\fi{} ${10}^{9}$ Hz/(nm mW) spectral brightness. These data are boosted by over 2 orders of magnitude compared with existing technologies. A 160-nm-broad bandwidth is engineered for eight-channel multiplexed energy-time entanglement. Harnessed by high-extinction-frequency correlation and Franson interferences up to 99.17% visibility, such energy-time-entanglement multiplexing further enhances the high-flux data rate and warrants broad application in quantum-information processing on a chip.