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Cavity-enhanced single-shot readout of a quantum dot spin within 3 nanoseconds

Author

Listed:
  • Nadia O. Antoniadis

    (University of Basel)

  • Mark R. Hogg

    (University of Basel)

  • Willy F. Stehl

    (University of Basel)

  • Alisa Javadi

    (University of Basel
    The University of Oklahoma)

  • Natasha Tomm

    (University of Basel)

  • Rüdiger Schott

    (Ruhr-Universität Bochum)

  • Sascha R. Valentin

    (Ruhr-Universität Bochum)

  • Andreas D. Wieck

    (Ruhr-Universität Bochum)

  • Arne Ludwig

    (Ruhr-Universität Bochum)

  • Richard J. Warburton

    (University of Basel)

Abstract

Rapid, high-fidelity single-shot readout of quantum states is a ubiquitous requirement in quantum information technologies. For emitters with a spin-preserving optical transition, spin readout can be achieved by driving the transition with a laser and detecting the emitted photons. The speed and fidelity of this approach is typically limited by low photon collection rates and measurement back-action. Here we use an open microcavity to enhance the optical readout signal from a semiconductor quantum dot spin state, largely overcoming these limitations. We achieve single-shot readout of an electron spin in only 3 nanoseconds with a fidelity of (95.2 ± 0.7)%, and observe quantum jumps using repeated single-shot measurements. Owing to the speed of our readout, errors resulting from measurement-induced back-action have minimal impact. Our work reduces the spin readout-time well below both the achievable spin relaxation and dephasing times in semiconductor quantum dots, opening up new possibilities for their use in quantum technologies.

Suggested Citation

  • Nadia O. Antoniadis & Mark R. Hogg & Willy F. Stehl & Alisa Javadi & Natasha Tomm & Rüdiger Schott & Sascha R. Valentin & Andreas D. Wieck & Arne Ludwig & Richard J. Warburton, 2023. "Cavity-enhanced single-shot readout of a quantum dot spin within 3 nanoseconds," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39568-1
    DOI: 10.1038/s41467-023-39568-1
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    References listed on IDEAS

    as
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