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Highly Efficient Coherent Optical Memory Based on Electromagnetically Induced Transparency.

Ya-Fen Hsiao1,2, Pin-Ju Tsai1,3, Hung-Shiue Chen1

  • 1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.

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|May 19, 2018
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This summary is machine-generated.

Researchers developed a high-efficiency quantum memory using electromagnetically induced transparency in cold atoms. This breakthrough advances quantum communication and information science with record-breaking storage efficiency and time-bandwidth product.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Atomic Physics

Background:

  • Quantum memory is essential for quantum repeaters in long-distance quantum communication.
  • High fidelity, efficiency, and storage time are critical for quantum memories to surpass direct photon transmission.

Purpose of the Study:

  • To develop a high-performance quantum memory.
  • To achieve record-breaking storage efficiency and time-bandwidth product for optical memory.

Main Methods:

  • Utilized electromagnetically induced transparency (EIT) in optically dense cold atomic media.
  • Implemented a coherent optical memory scheme.

Main Results:

  • Achieved a record storage efficiency of 92.0 (1.5)%.
  • Obtained a useful time-bandwidth product of 1200 (retrieval efficiency > 50%).
  • These results represent the best performance to date for optical memory schemes.

Conclusions:

  • The developed quantum memory significantly advances the performance of optical memory.
  • This work has crucial implications for quantum information science and quantum communication technologies.