Storage of telecom-C-band heralded single photons with orbital-angular-momentum encoding in a crystal  

作　　者：Yi-Lin Hu Tian-Shu Yang Zong-Quan Zhou Jian Wang Xiao Liu Zong-Feng Li Pei-Yun Li Yu Ma Chao Liu Peng-Jun Liang Jun Hu Xue Li Chuan-Feng Li Guang-Can Guo 

机构地区：[1]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Science Bulletin》2019年第21期1577-1583,共7页科学通报（英文版）

基　　金：supported by the National Key R&D Program of China(2017YFA0304100);the National Natural Science Foundation of China(61327901,11774331,11774335,11504362,11821404,and 11654002);Anhui Initiative in Quantum Information Technologies(AHY020100);Key Research Program of Frontier Sciences,CAS(QYZDY-SSW-SLH003);the Fundamental Research Funds for the Central Universities(WK2470000023,WK2470000026)

摘　　要：A memory-based quantum repeater architecture provides a solution to distribute quantum information to an arbitrary long distance.Practical quantum repeaters are likely to be built in optical-fiber networks which take advantage of the low-loss transmission between quantum memory nodes.Most quantum memory platforms have characteristic atomic transitions away from the telecommunication band.A nondegenerate photon pair source is therefore useful for connection of a quantum memory to optical fibers.Here,we report a high-brightness narrowband photon-pair source which is compatible with a rare-earth-ion-doped crystal Pr^3+:Y2SiO5.The photon-pair source is generated through a cavityenhanced spontaneous parametric down-conversion process with the signal photon at 606 nm and the idler photon at 1540 nm.Moreover,using the telecom C-band idler photons for heralding,we demonstrate the reversible transfer of orbital-angular-momentum qubit between the signal photon and the quantum memory based on Pr3^+:Y2SiO5.A memory-based quantum repeater architecture provides a solution to distribute quantum information to an arbitrary long distance.Practical quantum repeaters are likely to be built in optical-fiber networks which take advantage of the low-loss transmission between quantum memory nodes.Most quantum memory platforms have characteristic atomic transitions away from the telecommunication band.A nondegenerate photon pair source is therefore useful for connection of a quantum memory to optical fibers.Here,we report a high-brightness narrowband photon-pair source which is compatible with a rare-earth-ion-doped crystal Pr3+:Y2SiO5.The photon-pair source is generated through a cavityenhanced spontaneous parametric down-conversion process with the signal photon at 606 nm and the idler photon at 1540 nm.Moreover,using the telecom C-band idler photons for heralding,we demonstrate the reversible transfer of orbital-angular-momentum qubit between the signal photon and the quantum memory based on Pr3+:Y2SiO5.

关 键 词：QUANTUM REPEATER QUANTUM memory Heralded single PHOTONS ORBITAL angular momentum Telecommunication band 

分 类 号：O41[理学—理论物理]