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.
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)
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)。
