High fidelity coherent magnetic and electric control of a single spin-7/2 donor atom in Silicon

ORAL

Abstract

High-spin nuclei, such as the spin-7/2 system 123Sb, provide an optimal platform for advanced spin architectures [1]. They can be used to investigate fundamental physic as well as being the base of future quantum computing efforts. In addition to the standard magnetic field control, nuclear spins with I>1/2 exhibit an electric quadrupole moment that offers a way to control the nuclear spins using nuclear electric resonance. In this talk, we show full coherent magnetic and electric control of the 16-dimensional Hilbert space of a 123Sb donor. On the ionized nuclear spin, we demonstrate one-qubit gate fidelities of 99.8% using Gate Set Tomography. Measuring the state-dependent Ramsey coherence times of the donor nucleus allows us to separate electric and magnetic noise sources. These results lay the foundations for exploiting high-spin donor nuclei in experiments on logical qubit encoding [2], quantum sensing [3] and high-dimensional quantum information processing.

[1] S. Asaad et al., Nature 579, 205–209 (2020)

[2] J. Gross, Phys. Rev. Lett. 127, 010504 (2021)

[3] T. Chalopin et al., Nature Comm. 9, 4955 (2018)


*Australian Research Council (DP210103769) and US Army Research Office (W911NF-17-1-0200)

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Presenters

  • Daniel Schwienbacher

    • University of New South Wales Sydney
    • University of New South Wales

Authors

  • Daniel Schwienbacher

    • University of New South Wales Sydney
    • University of New South Wales

  • Irene Fernández de Fuentes

    • University of New South Wales

  • Arjen Vaartjes

    • University of New South Wales
    • Qutech, Delft university of Technology

  • Tim Botzem

    • University of New South Wales

  • Benjamin Joecker

    • 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

  • Alexander M Jakob

    • University of Melbourne

  • Kohei M Itoh

    • Keio Univ

  • 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.

  • David N Jamieson

    • University of Melbourne

  • Andrea Morello

    • University of New South Wales