Global coherent spin control of a SiMOS spin qubit using a 3D KTaO3 dielectric resonator

ORAL

Abstract

As spin qubit numbers are growing, novel scalable control mechanisms become crucial for large-scale qubit architectures. One promising approach to deliver homogeneous oscillating magnetic field over macroscopic length-scales is the use of 3D dielectric resonators. KTaO3 resonators have high permittivity at cryogenic temperatures, and have demonstrated fast and coherent control of spins in NV ensembles and single spin control in SiMOS quantum dots [1-3]. In this latter demonstration, charge noise originating from the Pd/ALD AlOx gate stack limited spin coherence, while electric coupling to metallic gate structures introduced unwanted microwave current loops impacting resonator quality factor and achievable driving speeds. Here, we will present our latest results on KTaO3 global spin control using a modified SiMOS spin qubit design with an optimised Al/thermally grown AlOx gate stack. Removing current loops identified by finite element simulations from the design, the measured resonator quality factor of 1200 improved by 50% compared to our previous generation device. Next to the latest results on global spin control, limiting factors of the resonator-device design will be discussed. This work highlights the promise of dielectric resonators for global spin control in large-scale spin qubit arrays.

*Funding: The authors acknowledge support from the Australian Research Council (DE190101397, FL190100167 and CE170100012), the US Army Research Office (W911NF17-1-0198) and the NSW Node of the Australian National Fabrication Facility. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the US Government. E.V. and J.P.S.-S. acknowledge support from Sydney Quantum Academy. The authors thank Kohei Itoh for the preparation of the isotopically-purified silicon substrate.

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Presenters

  • Nard Dumoulin Stuyck

    • UNSW
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.

Authors

  • Nard Dumoulin Stuyck

    • UNSW
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.

  • Ensar Vahapoglu

    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • 1) University of New South Wales

  • James Slack-Smith

    • 1) University of New South Wales

  • Wee Han Lim

    • 1) University of New South Wales, 2) Diraq Pty. Ltd
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • University of New South Wales

  • Fay E Hudson

    • 1) University of New South Wales, 2) Diraq Pty. Ltd
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • University of New South Wales

  • Tom Day

    • 1) University of New South Wales
    • University of New South Wales

  • Tuomo I Tanttu

    • 1) University of New South Wales, 2) Diraq Pty. Ltd
    • 1) University of New South Wales 2) Diraq
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.

  • Henry Yang

    • 1) University of New South Wales, 2) Diraq Pty. Ltd
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • UNSW Sydney

  • Andre Saraiva

    • 1) University of New South Wales, 2) Diraq Pty. Ltd
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • UNSW Sydney
    • UNSW
    • Diraq
    • University of New South Wales, Diraq Pty. Ltd.

  • Kohei M Itoh

    • Keio Univ

  • Arne Laucht

    • 1) University of New South Wales, 2) Diraq Pty. Ltd
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • University of New South Wales
    • University of New South Wales, Diraq Pty. Ltd.

  • Andrew S Dzurak

    • 1) University of New South Wales, 2) Diraq Pty. Ltd
    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • University of New South Wales
    • University of New South Wales, Diraq Pty. Ltd.

  • Jarryd J Pla

    • 1) University of New South Wales
    • University of New South Wales
    • UNSW Sydney