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High yield and ultrafast sources of electrically triggered entangled-photon pairs based on strain-tunable quantum dots

Author

Listed:
  • Jiaxiang Zhang

    (Institute for Integrative Nanosciences, IFW Dresden)

  • Johannes S. Wildmann

    (Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz)

  • Fei Ding

    (Institute for Integrative Nanosciences, IFW Dresden)

  • Rinaldo Trotta

    (Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz)

  • Yongheng Huo

    (Institute for Integrative Nanosciences, IFW Dresden
    Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz)

  • Eugenio Zallo

    (Institute for Integrative Nanosciences, IFW Dresden
    Present address: Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany.)

  • Daniel Huber

    (Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz)

  • Armando Rastelli

    (Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz)

  • Oliver G. Schmidt

    (Institute for Integrative Nanosciences, IFW Dresden
    Material Systems for Nanoelectronics, TU Chemnitz)

Abstract

Triggered sources of entangled photon pairs are key components in most quantum communication protocols. For practical quantum applications, electrical triggering would allow the realization of compact and deterministic sources of entangled photons. Entangled-light-emitting-diodes based on semiconductor quantum dots are among the most promising sources that can potentially address this task. However, entangled-light-emitting-diodes are plagued by a source of randomness, which results in a very low probability of finding quantum dots with sufficiently small fine structure splitting for entangled-photon generation (∼10−2). Here we introduce strain-tunable entangled-light-emitting-diodes that exploit piezoelectric-induced strains to tune quantum dots for entangled-photon generation. We demonstrate that up to 30% of the quantum dots in strain-tunable entangled-light-emitting-diodes emit polarization-entangled photons. An entanglement fidelity as high as 0.83 is achieved with fast temporal post selection. Driven at high speed, that is 400 MHz, strain-tunable entangled-light-emitting-diodes emerge as promising devices for high data-rate quantum applications.

Suggested Citation

  • Jiaxiang Zhang & Johannes S. Wildmann & Fei Ding & Rinaldo Trotta & Yongheng Huo & Eugenio Zallo & Daniel Huber & Armando Rastelli & Oliver G. Schmidt, 2015. "High yield and ultrafast sources of electrically triggered entangled-photon pairs based on strain-tunable quantum dots," Nature Communications, Nature, vol. 6(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms10067
    DOI: 10.1038/ncomms10067
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