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Fast spin exchange across a multielectron mediator

Author

Listed:
  • Filip K. Malinowski

    (University of Copenhagen)

  • Frederico Martins

    (University of Copenhagen)

  • Thomas B. Smith

    (The University of Sydney)

  • Stephen D. Bartlett

    (The University of Sydney)

  • Andrew C. Doherty

    (The University of Sydney)

  • Peter D. Nissen

    (University of Copenhagen)

  • Saeed Fallahi

    (Purdue University)

  • Geoffrey C. Gardner

    (Purdue University)

  • Michael J. Manfra

    (Purdue University
    Purdue University)

  • Charles M. Marcus

    (University of Copenhagen)

  • Ferdinand Kuemmeth

    (University of Copenhagen)

Abstract

Scalable quantum processors require tunable two-qubit gates that are fast, coherent and long-range. The Heisenberg exchange interaction offers fast and coherent couplings for spin qubits, but is intrinsically short-ranged. Here, we demonstrate that its range can be increased by employing a multielectron quantum dot as a mediator, while preserving speed and coherence of the resulting spin-spin coupling. We do this by placing a large quantum dot with 50–100 electrons between a pair of two-electron double quantum dots that can be operated and measured simultaneously. Two-spin correlations identify coherent spin-exchange processes across the multielectron quantum dot. We further show that different physical regimes of the mediated exchange interaction allow a reduced susceptibility to charge noise at sweet spots, as well as positive and negative coupling strengths up to several gigahertz. These properties make multielectron dots attractive as scalable, voltage-controlled coherent coupling elements.

Suggested Citation

  • Filip K. Malinowski & Frederico Martins & Thomas B. Smith & Stephen D. Bartlett & Andrew C. Doherty & Peter D. Nissen & Saeed Fallahi & Geoffrey C. Gardner & Michael J. Manfra & Charles M. Marcus & Fe, 2019. "Fast spin exchange across a multielectron mediator," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09194-x
    DOI: 10.1038/s41467-019-09194-x
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    Cited by:

    1. Akito Noiri & Kenta Takeda & Takashi Nakajima & Takashi Kobayashi & Amir Sammak & Giordano Scappucci & Seigo Tarucha, 2022. "A shuttling-based two-qubit logic gate for linking distant silicon quantum processors," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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