Quantum interference with independent single-photon sources over 300 km fiber  

作　　者：Xiang You Ming-Yang Zheng Si Chen Run-Ze Liu Jian Qin Mo-Chi Xu Zheng-Xuan Ge Tung-Hsun Chung Yu-Kun Qiao Yang-Fan Jiang Han-Sen Zhong Ming-Cheng Chen Hui Wang Yu-Ming He Xiu-Ping Xie Hao Li Li-Xing You Christian Schneider Juan Yin Teng-Yun Chen Mohamed Benyouce Yong-Heng Huo Sven Höfling Qiang Zhang Chao-Yang Lu Jian-Wei Pan 

机构地区：[1]University of Science and Technology of China,School of Cyberspace Security,Hefei,China [2]University of Science and Technology of China,Hefei National Laboratory for Physical Sciences at Microscale,Department of Modern Physics,Hefei,China [3]University of Science and Technology of China,CAS Centre for Excellence in Quantum Information and Quantum Physics,Shanghai,China [4]Jinan Institute of Quantum Technology,Jinan,China [5]Chinese Academy of Sciences,Shanghai Institute of Microsystem and Information Technology(SIMIT),State Key Laboratory of Functional Materials for Informatics,Shanghai,China [6]Universitat Würzburg,Technische Physik,Physikalisches Instität and Wilhelm Conrad Röntgen-Center for Complex Material Systems,Würzburg,Germany [7]University of Oldenburg,Institute of Physics,Oldenburg,Germany [8]University of Kassel,Institute of Nanostructure Technologies and Analytics,CINSaT,Kassel,Germany [9]NYU-ECNU Institute of Physics at NYU Shanghai,Shanghai,China

出　　处：《Advanced Photonics》2022年第6期64-70,共7页先进光子学（英文）

基　　金：the National Natural Science Foundation of China(91836303);the National Key R&D Program of China(2019YFA0308700);the Chinese Academy of Sciences,the Anhui Initiative in Quantum Information Technologies,the Natural Science Foundation of Shandong Province(ZR2020LLZ007);the ShanghaiMunicipal Science and Technology Major Project(2019SHZDZX01).

摘　　要：In the quest to realize a scalable quantum network,semiconductor quantum dots(QDs)offer distinct advantages,including high single-photon efficiency and indistinguishability,high repetition rate(tens of gigahertz with Purcell enhancement),interconnectivity with spin qubits,and a scalable on-chip platform.However,in the past two decades,the visibility of quantum interference between independent QDs rarely went beyond the classical limit of 50%,and the distances were limited from a few meters to kilometers.Here,we report quantum interference between two single photons from independent QDs separated by a 302 km optical fiber.The single photons are generated from resonantly driven single QDs deterministically coupled to microcavities.Quantum frequency conversions are used to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunication band.The observed interference visibility is 0.670.02(0.930.04)without(with)temporal filtering.Feasible improvements can further extend the distance to∼600 km.Our work represents a key step to long-distance solid-state quantum networks.

关 键 词：quantum networks quantum dots solid-state single-photon sources quantum frequency conversion quantum interference 

分 类 号：O431.2[机械工程—光学工程]