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A waveguide frequency converter connecting rubidium-based quantum memories to the telecom C-band

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  • Boris Albrecht

    (ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park)

  • Pau Farrera

    (ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park)

  • Xavier Fernandez-Gonzalvo

    (ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park
    Present address: Department of Physics, University of Otago, 730 Cumberland Street, 9016 Dunedin, New Zealand)

  • Matteo Cristiani

    (ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park)

  • Hugues de Riedmatten

    (ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park
    ICREA-Institució Catalana de Recerca i Estudis Avançats)

Abstract

Coherently converting the frequency and temporal waveform of single and entangled photons will be crucial to interconnect the various elements of future quantum information networks. Of particular importance is the quantum frequency conversion of photons emitted by material systems able to store quantum information, so-called quantum memories. There have been significant efforts to implement quantum frequency conversion using nonlinear crystals, with non-classical light from broadband photon-pair sources and solid-state emitters. However, solid state quantum frequency conversion has not yet been achieved with long-lived optical quantum memories. Here we demonstrate an ultra-low-noise solid state photonic quantum interface suitable for connecting quantum memories based on atomic ensembles to the telecommunication fibre network. The interface is based on an integrated-waveguide nonlinear device. We convert heralded single photons at 780 nm from a rubidium-based quantum memory to the telecommunication wavelength of 1,552 nm, showing significant non-classical correlations between the converted photon and the heralding signal.

Suggested Citation

  • Boris Albrecht & Pau Farrera & Xavier Fernandez-Gonzalvo & Matteo Cristiani & Hugues de Riedmatten, 2014. "A waveguide frequency converter connecting rubidium-based quantum memories to the telecom C-band," Nature Communications, Nature, vol. 5(1), pages 1-6, May.
  • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4376
    DOI: 10.1038/ncomms4376
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