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Single-photon-level quantum image memory based on cold atomic ensembles

Author

Listed:
  • Dong-Sheng Ding

    (Key Laboratory of Quantum Information, University of Science and Technology of China)

  • Zhi-Yuan Zhou

    (Key Laboratory of Quantum Information, University of Science and Technology of China)

  • Bao-Sen Shi

    (Key Laboratory of Quantum Information, University of Science and Technology of China)

  • Guang-Can Guo

    (Key Laboratory of Quantum Information, University of Science and Technology of China)

Abstract

A quantum memory is a key component for quantum networks, which will enable the distribution of quantum information. Its successful development requires storage of single-photon light. Encoding photons with spatial shape through higher-dimensional states significantly increases their information-carrying capability and network capacity. However, constructing such quantum memories is challenging. Here we report the first experimental realization of a true single-photon-carrying orbital angular momentum stored via electromagnetically induced transparency in a cold atomic ensemble. Our experiments show that the non-classical pair correlation between trigger photon and retrieved photon is retained, and the spatial structure of input and retrieved photons exhibits strong similarity. More importantly, we demonstrate that single-photon coherence is preserved during storage. The ability to store spatial structure at the single-photon level opens the possibility for high-dimensional quantum memories.

Suggested Citation

  • Dong-Sheng Ding & Zhi-Yuan Zhou & Bao-Sen Shi & Guang-Can Guo, 2013. "Single-photon-level quantum image memory based on cold atomic ensembles," Nature Communications, Nature, vol. 4(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3527
    DOI: 10.1038/ncomms3527
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