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Time-bin entangled photons from a quantum dot

Author

Listed:
  • Harishankar Jayakumar

    (Institut für Experimentalphysik, Universität Innsbruck)

  • Ana Predojević

    (Institut für Experimentalphysik, Universität Innsbruck)

  • Thomas Kauten

    (Institut für Experimentalphysik, Universität Innsbruck)

  • Tobias Huber

    (Institut für Experimentalphysik, Universität Innsbruck)

  • Glenn S. Solomon

    (Joint Quantum Institute, National Institute of Standards and Technology & University of Maryland)

  • Gregor Weihs

    (Institut für Experimentalphysik, Universität Innsbruck
    Institute for Quantum Computing, University of Waterloo, 200 University Ave W, Waterloo, Ontario, Canada N2L 3G1)

Abstract

Long-distance quantum communication is one of the prime goals in the field of quantum information science. With information encoded in the quantum state of photons, existing telecommunication fibre networks can be effectively used as a transport medium. To achieve this goal, a source of robust entangled single-photon pairs is required. Here we report the realization of a source of time-bin entangled photon pairs utilizing the biexciton–exciton cascade in a III/V self-assembled quantum dot. We analyse the generated photon pairs by an inherently phase-stable interferometry technique, facilitating uninterrupted long integration times. We confirm the entanglement by performing quantum state tomography of the emitted photons, which yields a fidelity of 0.69(3) and a concurrence of 0.41(6) for our realization of time-energy entanglement from a single quantum emitter.

Suggested Citation

  • Harishankar Jayakumar & Ana Predojević & Thomas Kauten & Tobias Huber & Glenn S. Solomon & Gregor Weihs, 2014. "Time-bin entangled photons from a quantum dot," Nature Communications, Nature, vol. 5(1), pages 1-5, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5251
    DOI: 10.1038/ncomms5251
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