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Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions

Author

Listed:
  • Robert Keil

    (Institute for Integrative Nanosciences, IFW Dresden)

  • Michael Zopf

    (Institute for Integrative Nanosciences, IFW Dresden)

  • Yan Chen

    (Institute for Integrative Nanosciences, IFW Dresden)

  • Bianca Höfer

    (Institute for Integrative Nanosciences, IFW Dresden)

  • Jiaxiang Zhang

    (Institute for Integrative Nanosciences, IFW Dresden)

  • Fei Ding

    (Institute for Integrative Nanosciences, IFW Dresden
    Institut für Festkörperphysik, Leibniz Universität Hannover)

  • Oliver G. Schmidt

    (Institute for Integrative Nanosciences, IFW Dresden
    Merge Technologies for Multifunctional Lightweight Structures, Technische Universität Chemnitz)

Abstract

Semiconductor InAs/GaAs quantum dots grown by the Stranski–Krastanov method are among the leading candidates for the deterministic generation of polarization-entangled photon pairs. Despite remarkable progress in the past 20 years, many challenges still remain for this material, such as the extremely low yield, the low degree of entanglement and the large wavelength distribution. Here, we show that with an emerging family of GaAs/AlGaAs quantum dots grown by droplet etching and nanohole infilling, it is possible to obtain a large ensemble of polarization-entangled photon emitters on a wafer without any post-growth tuning. Under pulsed resonant two-photon excitation, all measured quantum dots emit single pairs of entangled photons with ultra-high purity, high degree of entanglement and ultra-narrow wavelength distribution at rubidium transitions. Therefore, this material system is an attractive candidate for the realization of a solid-state quantum repeater—among many other key enabling quantum photonic elements.

Suggested Citation

  • Robert Keil & Michael Zopf & Yan Chen & Bianca Höfer & Jiaxiang Zhang & Fei Ding & Oliver G. Schmidt, 2017. "Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15501
    DOI: 10.1038/ncomms15501
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