Polarization insensitive frequency conversion for an atom-photon entanglement distribution via a telecom network

Rikizo Ikuta (), Toshiki Kobayashi, Tetsuo Kawakami, Shigehito Miki, Masahiro Yabuno, Taro Yamashita, Hirotaka Terai, Masato Koashi, Tetsuya Mukai, Takashi Yamamoto and Nobuyuki Imoto ()
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Rikizo Ikuta: Osaka University
Toshiki Kobayashi: Osaka University
Tetsuo Kawakami: Osaka University
Shigehito Miki: National Institute of Information and Communications Technology (NICT)
Masahiro Yabuno: National Institute of Information and Communications Technology (NICT)
Taro Yamashita: National Institute of Information and Communications Technology (NICT)
Hirotaka Terai: National Institute of Information and Communications Technology (NICT)
Masato Koashi: The University of Tokyo
Tetsuya Mukai: NTT Corporation
Takashi Yamamoto: Osaka University
Nobuyuki Imoto: Osaka University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Long-lifetime quantum storages accessible to the telecom photonic infrastructure are essential to long-distance quantum communication. Atomic quantum storages have achieved subsecond storage time corresponding to 1000 km transmission time for a telecom photon through a quantum repeater algorithm. However, the telecom photon cannot be directly interfaced to typical atomic storages. Solid-state quantum frequency conversions fill this wavelength gap. Here we report on the experimental demonstration of a polarization-insensitive solid-state quantum frequency conversion to a telecom photon from a short-wavelength photon entangled with an atomic ensemble. Atom–photon entanglement has been generated with a Rb atomic ensemble and the photon has been translated to telecom range while retaining the entanglement by our nonlinear-crystal-based frequency converter in a Sagnac interferometer.

Date: 2018
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DOI: 10.1038/s41467-018-04338-x

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