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(College of Precision Instrument and Opto-Electronics Engineering,Key Laboratory of Opto-Electronics Information Technology,Ministry of Education,Tianjin University,Tianjin 300072,China;School of Physics,Taiyuan University of Technology,Taiyuan 030000,China)

机构地区：[1]College of Precision Instrument and Opto-Electronics Engineering,Key Laboratory of Opto-Electronics Information Technology,Ministry of Education,Tianjin University,Tianjin 300072,China [2]School of Physics,Taiyuan University of Technology,Taiyuan 030000,China

出　　处：《Chinese Optics Letters》2024年第5期106-110,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.12074283,91836302,11874279,and 62305240)

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 pulses.The 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 distribution.The mode number of the photon pairs deduced from the measured joint spectrum is∼1.03.The 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.

关 键 词：polarization-entangled photon pairs nonlinear interferometer quantum state engineering optical fiber 

分 类 号：O431.2[机械工程—光学工程]