Compact generation scheme of path–frequency hyperentangled photons using 2D periodical nonlinear photonic crystal  

作　　者：陈洋河 季波 李念芹 姜震 李维 李昱东 冯梁森 武腾飞 何广强 Yang-He Chen;Bo Ji;Nian-Qin Li;Zhen Jiang;Wei Li;Yu-Dong Li;Liang-Sen Feng;Teng-Fei Wu;Guang-Qiang He(SJTU Pinghu Institute of Intelligent Optoelectronics,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Science and Technology on Metrology and Calibration Laboratory,Changcheng Institute of Metrology&Measurement,Aviation Industry Corporation of China,Beijing 100095,China)

机构地区：[1]SJTU Pinghu Institute of Intelligent Optoelectronics,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [3]Science and Technology on Metrology and Calibration Laboratory,Changcheng Institute of Metrology&Measurement,Aviation Industry Corporation of China,Beijing 100095,China

出　　处：《Chinese Physics B》2023年第12期256-262,共7页中国物理B（英文版）

基　　金：Project supported by the Key-Area Research and Development Program of Guangdong Province of China (Grant No.2018B030325002);the National Natural Science Foundation of China (Grant No.62075129);the Open Project Program of SJTU-Pinghu Institute of Intelligent Optoelectronics (Grant No.2022SPIOE204);the Science and Technology on Metrology and Calibration Laboratory (Grant No.JLJK2022001B002);the Sichuan Provincial Key Laboratory of Microwave Photonics (Grant No.2023-04)。

摘　　要：Hyperentanglement is a promising resource for achieving high capacity quantum communication.Here,we propose a compact scheme for the generation of path-frequency hyperentangled photon pairs via spontaneous parametric down-conversion(SPDC)processes,where six different paths and two different frequencies are covered.A two-dimensional periodicalχ^((2))nonlinear photonic crystal(NPC)is designed to satisfy type-Ⅰquasi-phase-matching conditions in the plane perpendicular to the incident pump beam,and a perfect phase match is achieved along the pump beam's direction to ensure high conversion efficiency,with theoretically estimated photon flux up to 2.068×10^(5) pairs·s^(-1)·mm^(-2).We theoretically calculate the joint-spectral amplitude(JSA)of the generated photon pair and perform Schmidt decomposition on it,where the resulting entropy S of entanglement and effective Schmidt rank K reach 3.2789 and 6.4675,respectively.Our hyperentangled photon source scheme could provide new avenues for high-dimensional quantum communication and high-speed quantum information processing.

关 键 词：hyperentanglement nonlinear photonic crystal QUASI-PHASE-MATCHING 

分 类 号：O431.2[机械工程—光学工程]