Author(s): Pei Wan (万佩), Wen-Zheng Zhu (朱文正), Yan-Chao Lou (娄严超), Zi-Mo Cheng (程子默), Zhi-Cheng Ren (任志成), Han Zhang (张涵), Xi-Lin Wang (汪喜林), and Hui-Tian Wang (王慧田)
Cavity-enhanced spontaneous parametric down-conversion (SPDC) provides a significant way to produce $∼10\text{ }\text{ }\mathrm{MHz}$ narrow-band photon pairs, which matches the bandwidth of photon for quantum memory. However, the output photon pairs from the cavity are not entangled...