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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)


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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