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Wide-band quantum interface for visible-to-telecommunication wavelength conversion

Author

Listed:
  • Rikizo Ikuta

    (Graduate School of Engineering Science, Osaka University)

  • Yoshiaki Kusaka

    (Graduate School of Engineering Science, Osaka University)

  • Tsuyoshi Kitano

    (Graduate School of Engineering Science, Osaka University)

  • Hiroshi Kato

    (Graduate School of Engineering Science, Osaka University)

  • Takashi Yamamoto

    (Graduate School of Engineering Science, Osaka University)

  • Masato Koashi

    (Photon Science Centre, The University of Tokyo)

  • Nobuyuki Imoto

    (Graduate School of Engineering Science, Osaka University)

Abstract

Although near-infrared photons in telecommunication bands are required for long-distance quantum communication, various quantum information tasks have been performed by using visible photons for the past two decades. Recently, such visible photons from diverse media including atomic quantum memories have also been studied. Optical frequency down-conversion from visible to telecommunication bands while keeping the quantum states is thus required for bridging such wavelength gaps. Here we report demonstration of a quantum interface of frequency down-conversion from visible to telecommunication bands by using a nonlinear crystal, which has a potential to work over wide bandwidths, leading to a high-speed interface of frequency conversion. We achieved the conversion of a picosecond visible photon at 780 nm to a 1,522-nm photon, and observed that the conversion process retained entanglement between the down-converted photon and another photon.

Suggested Citation

  • Rikizo Ikuta & Yoshiaki Kusaka & Tsuyoshi Kitano & Hiroshi Kato & Takashi Yamamoto & Masato Koashi & Nobuyuki Imoto, 2011. "Wide-band quantum interface for visible-to-telecommunication wavelength conversion," Nature Communications, Nature, vol. 2(1), pages 1-5, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1544
    DOI: 10.1038/ncomms1544
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