High-dimensional entanglement between distant atomic-ensemble memories  

作　　者：Dong-Sheng Ding Wei Zhang Shuai Shi Zhi-Yuan Zhou Yan Li 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 and Quantum Physics,University of Science and Technology of China,Hefei,Anhui 230026,China

出　　处：《Light(Science & Applications)》2016年第1期451-457,共7页光（科学与应用)（英文版）

基　　金：supported by the National Fundamental Research Program of China(Grant No.2011CBA00200);the National Natural Science Foundation of China(Grant Nos.11174271,61275115,61435011 and 61525504).

摘　　要：Entangled quantum states in high-dimensional space show many advantages compared with entangled states in two-dimensional space.The former enable quantum communication with higher channel capacity,enable more efficient quantum-information processing and are more feasible for closing the detection loophole in Bell test experiments.Establishing high-dimensional entangled memories is essential for long-distance communication,but its experimental realization is lacking.We experimentally established high-dimensional entanglement in orbital angular momentum space between two atomic ensembles separated by 1 m.We reconstructed the density matrix for a three-dimensional entanglement and obtained an entanglement fidelity of(83.9±2.9)%.More importantly,we confirmed the successful preparation of a state entangled in more than three-dimensional space(up to seven-dimensional)using entanglement witnesses.Achieving high-dimensional entanglement represents a significant step toward a high-capacity quantum network.

关 键 词：high-dimensional entanglement orbital angular momentum quantum memory 

分 类 号：O41[理学—理论物理]