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Strong coupling of a superconducting flux qubit to single bismuth donors

Author

Listed:
  • Tikai Chang

    (Department of Physics & Bar-Ilan Institute of Nanotechnology and Advanced Materials (BINA))

  • Itamar Holzman

    (Department of Physics & Bar-Ilan Institute of Nanotechnology and Advanced Materials (BINA))

  • Shao Qi Lim

    (University of Melbourne)

  • Danielle Holmes

    (University of Melbourne)

  • Brett C. Johnson

    (RMIT University)

  • David N. Jamieson

    (University of Melbourne)

  • Michael Stern

    (Department of Physics & Bar-Ilan Institute of Nanotechnology and Advanced Materials (BINA)
    Technion—Israel Institute of Technology)

Abstract

The realization of a quantum computer represents a tremendous scientific and technological challenge due to the extreme fragility of quantum information. The physical support of information, namely the quantum bit or qubit, must at the same time be strongly coupled to other qubits by gates to compute information, and well decoupled from its environment to keep its quantum behavior. An interesting physical system for realizing such qubits are magnetic impurities in semiconductors, such as bismuth donors in silicon. Indeed, spins associated to bismuth donors can reach an extremely long coherence time - of the order of seconds. Yet it is extremely difficult to establish and control efficient gates between these spins. Here we demonstrate a protocol where single bismuth donors can coherently transfer their quantum information to a superconducting flux qubit, which acts as a mediator or quantum bus. This superconducting device allows to connect distant spins on-demand with little impact on their coherent behavior.

Suggested Citation

  • Tikai Chang & Itamar Holzman & Shao Qi Lim & Danielle Holmes & Brett C. Johnson & David N. Jamieson & Michael Stern, 2025. "Strong coupling of a superconducting flux qubit to single bismuth donors," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-64757-5
    DOI: 10.1038/s41467-025-64757-5
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    References listed on IDEAS

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