Quantum frequency down-conversion of single photons at 1552 nm from single InAs quantum dot  

作　　者：Ben Ma Si-Hang Wei Ze-Sheng Chen Xiang-Jun Shang Hai-Qiao Ni Zhi-Chuan Niu 马奔;魏思航;陈泽升;尚向军;倪海桥;牛智川(State Key Laboratory of Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 101418,China;Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China [2]College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 101418, China [3]Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

出　　处：《Chinese Physics B》2018年第9期595-599,共5页中国物理B（英文版）

基　　金：Project supported by the National Key Technologies R&D Program of China(Grant No.2018YFA0306101);the Scientific Instrument Developing Project of Chinese Academy of Sciences(Grant No.YJKYYQ20170032);the National Natural Science Foundation of China(Grant No.61505196)

摘　　要：Near-infrared single photon sources in telecommunication bands, especially at 1550 nm, are required for long-distance quantum communication. Here a down-conversion quantum interface is implemented, where the single photons emitted from single In As quantum dot at 864 nm is down converted to 1552 nm by using a fiber-coupled periodically poled lithium niobate（PPLN） waveguide and a 1.95 μmm pump laser, and the frequency conversion efficiency is ~40%. The singlephoton purity of quantum dot emission is preserved during the down-conversion process, i.e., g^（（2））（0）, only 0.22 at 1552 nm.This present technique advances the Ⅲ-Ⅴ semiconductor quantum dots as a promising platform for long-distance quantum communication.Near-infrared single photon sources in telecommunication bands, especially at 1550 nm, are required for long-distance quantum communication. Here a down-conversion quantum interface is implemented, where the single photons emitted from single In As quantum dot at 864 nm is down converted to 1552 nm by using a fiber-coupled periodically poled lithium niobate（PPLN） waveguide and a 1.95 μmm pump laser, and the frequency conversion efficiency is ~40%. The singlephoton purity of quantum dot emission is preserved during the down-conversion process, i.e., g^（（2））（0）, only 0.22 at 1552 nm.This present technique advances the Ⅲ-Ⅴ semiconductor quantum dots as a promising platform for long-distance quantum communication.

关 键 词：quantum frequency down-conversion quantum dot telecommunication band single photon 

分 类 号：O413[理学—理论物理] TN918[理学—物理]