Polarization-entangled photon pairs with factorable spectra engineered by using an uneven four-stage nonlinear interferometer

作     者：崔亮 陈浩然 李嘉敏 李小英 Liang Cui;Haoran Chen;Jiamin Li;Xiaoying Li

作者机构：College of Precision Instrument and Opto-Electronics EngineeringKey Laboratory of Opto-Electronics Information TechnologyMinistry of EducationTianjin UniversityTianjin 300072China School of PhysicsTaiyuan University of TechnologyTaiyuan 030000China 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2024年第22卷第5期

页      面：106-110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：supported by the National Natural Science Foundation of China (Nos.12074283 91836302 11874279 and 62305240) 

主　　题：polarization-entangled photon pairs nonlinear interferometer quantum state engineering optical fiber 

摘      要：We report the generation of polarization-entangled photon pairs in the 1550 nm band by pumping an uneven nonlinear interferometer loop with two orthogonally polarized counterpropagating pump *** uneven nonlinear interferometer,providing a more ideal interference pattern due to the elimination of secondary maxima,consists of four pieces of dispersion-shifted fibers sandwiched with three pieces of standard single-mode fibers,and the lengths of the nonlinear fibers follow the binomial *** mode number of the photon pairs deduced from the measured joint spectrum is∼*** collection efficiency of the photon pairs is found to be∼94%(after background noise correction).The directly measured visibility of two-photon interference of the polarization-entangled photon pairs is∼92%,while no interference is observed in the direct detection of either the signal or idler photons.