基于周期极化铌酸锂晶体的纯态单光子源  

Pure state single-photon sources based on periodically poled lithium niobate crystal

作　　者：张群永[1] 邹守达 王亮 裴旭 ZHANG Qunyong;ZOU Shouda;WANG Liang;PEI Xu(Faculty of Mathematics and Physics,Huaiyin Institute of Technology,Huai′an,Jiangsu 223003,China;School of Science,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210023,China;Faculty of Mechanical and Material Engineering,Huaiyin Institute of Technology,Huai′an,Jiangsu 223003,China)

机构地区：[1]淮阴工学院数理学院,江苏淮安223003 [2]南京邮电大学理学院,江苏南京210023 [3]淮阴工学院机械与材料工程学院,江苏淮安223003

出　　处：《光电子．激光》2022年第10期1082-1086,共5页Journal of Optoelectronics·Laser

基　　金：江苏省高等学校自然科学研究面上项目(18KJD140001)资助项目

摘　　要：纯态单光子源是光量子信息技术的重要资源,它在量子通信、量子计算等新一代信息技术中具有重要的应用价值。本文基于周期极化铌酸锂(periodically poled lithium niobate,PPLN)晶体提出一种小型化、可预知单光子源的制备方案,在满足群速度匹配和准相位匹配条件下,设计一种非简并自发参量下转换过程,产生频率解关联的光子对,进而实现可预知纯态单光子源的制备。从理论上推导出频率解关联的参数条件,详细计算不同条件下光子对产率,研究发现:相同参数条件下,在铌酸锂晶体波导结构中,光子的产生效率比相应体块晶体中提高4—6个数量级。研究结果有助于提高小型化单光子源的纯度和产率,对集成化量子光学芯片进一步发展具有重要推动作用。Sources of single-photon in pure quantum states are vital resource for quantum information technologies,and have many important application values in new generation information technology,such as quantum communication and quantum computing.Here,we propose a scheme on the miniaturized and heralded generation of pure single-photon through periodically poled lithium niobate(PPLN)crystal.Under the conditions of group velocity matching and quasi phase matching,a non-degenerate spontaneous parametric down-conversion process is designed to generate frequency uncorrelated photon pairs,thus realizing the preparation of heralded pure state single-photon sources.The parameter conditions of frequency uncorrelation are deduced theoretically,and the yield of photon pairs under different conditions are calculated.It is found that the generation efficiency in the lithium niobate crystal waveguide structure are 4—6 orders of magnitude higher than that in the corresponding bulk crystal under the same parameters.These results will be helpful to improve the purity and the yield of miniaturized single-photon sources,and will play an important role in promoting the further development of integrated quantum optical chips.

关 键 词：量子光学 自发参量下转换 周期极化铌酸锂 单光子源 

分 类 号：O431.2[机械工程—光学工程]