Journal of the Korean Physical Society

, Volume 70, Issue 11, pp 1007–1010 | Cite as

Light storage in a cold atomic ensemble with a high optical depth

  • Kwang-Kyoon Park
  • Young-Tak Chough
  • Yoon-Ho KimEmail author


A quantum memory with a high storage efficiency and a long coherence time is an essential element in quantum information applications. Here, we report our recent development of an optical quantum memory with a rubidium-87 cold atom ensemble. By increasing the optical depth of the medium, we have achieved a storage efficiency of 65% and a coherence time of 51 μs for a weak laser pulse. The result of a numerical analysis based on the Maxwell-Bloch equations agrees well with the experimental results. Our result paves the way toward an efficient optical quantum memory and may find applications in photonic quantum information processing.


Quantum memory Light storage Cold atoms Electromagnetically induced transparency 


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Copyright information

© The Korean Physical Society 2017

Authors and Affiliations

  • Kwang-Kyoon Park
    • 1
  • Young-Tak Chough
    • 2
  • Yoon-Ho Kim
    • 1
    Email author
  1. 1.Department of PhysicsPohang University of Science and Technology (POSTECH)PohangKorea
  2. 2.Department of Medical TechnologyGwangju UniversityGwangjuKorea

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