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Deterministic photon source of genuine three-qubit entanglement

Author

Listed:
  • Yijian Meng

    (University of Copenhagen)

  • Ming Lai Chan

    (University of Copenhagen)

  • Rasmus B. Nielsen

    (University of Copenhagen)

  • Martin H. Appel

    (University of Copenhagen
    University of Cambridge)

  • Zhe Liu

    (University of Copenhagen)

  • Ying Wang

    (University of Copenhagen)

  • Nikolai Bart

    (Ruhr-Universität Bochum)

  • Andreas D. Wieck

    (Ruhr-Universität Bochum)

  • Arne Ludwig

    (Ruhr-Universität Bochum)

  • Leonardo Midolo

    (University of Copenhagen)

  • Alexey Tiranov

    (University of Copenhagen
    Université PSL, CNRS, Institut de Recherche de Chimie Paris)

  • Anders S. Sørensen

    (University of Copenhagen)

  • Peter Lodahl

    (University of Copenhagen)

Abstract

Deterministic photon sources allow long-term advancements in quantum optics. A single quantum emitter embedded in a photonic resonator or waveguide may be triggered to emit one photon at a time into a desired optical mode. By coherently controlling a single spin in the emitter, multi-photon entanglement can be realized. We demonstrate a deterministic source of three-qubit entanglement based on a single electron spin trapped in a quantum dot embedded in a planar nanophotonic waveguide. We implement nuclear spin narrowing to increase the spin dephasing time to $${T}_{2}^{*}\simeq 33$$ T 2 * ≃ 33 ns, which enables high-fidelity coherent optical spin rotations, and realize a spin-echo pulse sequence for sequential generation of spin-photon and spin-photon-photon entanglement. The emitted photons are highly indistinguishable, which is a key requirement for scalability and enables subsequent photon fusions to realize larger entangled states. This work presents a scalable deterministic source of multi-photon entanglement with a clear pathway for further improvements, offering promising applications in photonic quantum computing or quantum networks.

Suggested Citation

  • Yijian Meng & Ming Lai Chan & Rasmus B. Nielsen & Martin H. Appel & Zhe Liu & Ying Wang & Nikolai Bart & Andreas D. Wieck & Arne Ludwig & Leonardo Midolo & Alexey Tiranov & Anders S. Sørensen & Peter , 2024. "Deterministic photon source of genuine three-qubit entanglement," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52086-y
    DOI: 10.1038/s41467-024-52086-y
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    References listed on IDEAS

    as
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