High-flux entangled photon source is the key resource for quantum optical study and application. Here it is realized in a lithium niobate on isolator (LNOI) chip, with 2.79*10^11 Hz/mW photon pair rate and 1.53*10^9 Hz/nm/mW spectral brightness. These data are boosted by over two orders of magnitude compared to existing technologies. A 130-nm broad bandwidth is engineered for 8-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 high-flux data rate, and warrants broad applications in quantum information processing on a chip.
@article{arxiv.2012.06092,
title = {Ultra-bright multiplexed energy-time entangled photon generation from lithium niobate on insulator chip},
author = {Guang-Tai Xue and Yun-Fei Niu and Xiaoyue Liu and Jia-Chen Duan and Wenjun Chen and Ying Pan and Kunpeng Jia and Xiaohan Wang and Hua-Ying Liu and Yong Zhang and Ping Xu and Gang Zhao and Xinlun Cai and Yan-Xiao Gong and Xiaopeng Hu and Zhenda Xie and Shining Zhu},
journal= {arXiv preprint arXiv:2012.06092},
year = {2021}
}