Improving the spectral purity of single photons by a single-interferometer-coupled microring

作     者：王洋 朱枰谕 薛诗川 刘英文 吴俊杰 杨学军 徐平 Yang Wang;Pingyu Zhu;Shichuan Xue;Yingwen Liu;Junjie Wu;Xuejun Yang;Ping Xu

作者机构：Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410013China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2022年第31卷第3期

页      面：311-315页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Project supported by the National Basic Research Program of China (Grant Nos. 2019YFA0308700 and 2017YFA0303700) the Open Funds from the State Key Laboratory of High Performance Computing of China (HPCL, National University of Defense Technology) 

主　　题：spectral-purity microring asymmetric Mach–Zehnder interferometer 

摘      要：We experimentally engineer a high-spectral-purity single-photon source using a single-interferometer-coupled silicon microring. By the reconfiguration of the interferometer, different coupling conditions can be obtained, corresponding to different quality factors for the pump and signal/idler. The ratio between the quality factor of the pump and signal/idler ranges from 0.29 to 2.57. By constructing the signal–idler joint spectral intensity, we intuitively demonstrate the spectral correlation of the signal and idler. As the ratio between the quality factor of the pump and signal/idler increases, the spectral correlation of the signal and idler decreases, i.e., the spectral purity of the signal/idler photons increases. Furthermore,time-integrated second-order correlation of the signal photons is measured, giving a value up to 94.95 ± 3.46%. Such high-spectral-purity photons will improve the visibility of quantum interference and facilitate the development of on-chip quantum information processing.