Towards Highly Storage Efficiency of Optical Quantum Memory Based on Electromagnetically Induced Transparency Protocol

Towards Highly Storage Efficiency of Optical Quantum Memory Based on Electromagnetically Induced Transparency Protocol

  • Date: Sep 16, 2019
  • Time: 14:00
  • Speaker: Ya-Fen Hsiao
  • Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan
  • Location: Max-Planck-Institut für Quantenoptik
  • Room: Herbert Walther Lecture Hall
  • Host: MPQ, Quantum Dynamics Division
Long-distance quantum communication based on quantum repeater protocol

Long-distance quantum communication based on quantum repeater protocol is an important topic in quantum information science. To outperform the direct transmission of light in fiber, quantum memories with high-efficiency, high fidelity, high capacity and long storage time is crucial. Here we achieve a high storage efficiency of 92% for an optical memory based on EIT scheme with cold atomic media of optical depth around 1000. To realize the true quantum memory, we have performed the storage of single photons generated by cavity-enhanced spontaneous parametric down conversion(SPDC). In the preliminary experiment, we have achieved a storage efficiency (SE) of 50%. Further improvements towards a high efficiency will be discussed.

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