High-dimensional entanglement between distant atomic-ensemble memories

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

doi:10.1038/lsa.2016.157

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High-dimensional entanglement between distant atomic-ensemble memories

Original Articles

- High-dimensional entanglement between distant atomic-ensemble memories
- Light: Science & Applications Vol. 5, Issue 4, (2016)
- Affiliations：
  
  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
- Author bio：
  
  D-S Ding, Email: dds@ustc.edu.cn
  B-S Shi, Email: drshi@ustc.edu.cn
- Funds：
- DOI：10.1038/lsa.2016.157
  CLC：
- Published：2016-12，
  
  Published Online：25 April 2016，
  
  Received：25 November 2015，
  
  Revised：19 April 2016，
  
  Accepted：19 April 2016
- Accepted：
Scan QR Code
Ding, D. S. et al. High-dimensional entanglement between distant atomic-ensemble memories. Light: Science & Applications, 5, e16157 (2016).
DOI：

Ding, D. S. et al. High-dimensional entanglement between distant atomic-ensemble memories. Light: Science & Applications, 5, e16157 (2016). DOI： 10.1038/lsa.2016.157.

摘要

Abstract

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

Keywords

high-dimensional entanglementorbital angular momentumquantum memory

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