Orbital angular momentum photonic quantum interface  

作　　者：Zhi-Yuan Zhou Yan Li Dong-Sheng Ding Wei Zhang Shuai Shi Bao-Sen Shi Guang-Can Guo 

机构地区：[1]Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei,Anhui 230026,China [2]Synergetic Innovation Center of Quantum Information&Quantum Physics,University of Science and Technology of China,Hefei,Anhui 230026,China

出　　处：《Light(Science & Applications)》2016年第1期723-729,共7页光（科学与应用)（英文版）

基　　金：supported by the National Fundamental Research Program of China(2011CBA00200);the National Natural Science Foundation of China(11174271,61275115,and 61435011);the Innovation Fund from the Chinese Academy of Sciences.

摘　　要：Light-carrying orbital angular momentum(OAM)has great potential in enhancing the information channel capacity in both classical and quantum optical communications.Long distance optical communication requires the wavelengths of light are situated in the low-loss communication windows,but most quantum memories currently being developed for use in a quantum repeater work at different wavelengths,so a quantum interface to bridge the wavelength gap is necessary.So far,such an interface for OAM-carried light has not been realized yet.Here,we report the first experimental realization of a quantum interface for a heralded single photon carrying OAM using a nonlinear crystal in an optical cavity.The spatial structures of input and output photons exhibit strong similarity.More importantly,single-photon coherence is preserved during up-conversion as demonstrated.

关 键 词：frequency conversion spontaneous parametric down conversion sum frequency generation orbital angular momentum 

分 类 号：X70[环境科学与工程—环境工程]