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Coherent quantum control of a single <sup>123</sup>Sb atom in silicon.

ORAL

Abstract

High-spin nuclei – such as the spin-7/2 from 123Sb - implanted in a silicon nano-device provide a compelling platform for advancing donor spin quantum architectures as well as investigating fundamental physics. The quadrupolar interaction in heavy group-V donors offers a natural way to control nuclear spins using electric fields, which are easier to confine in a nanoscale device, as opposed to magnetic fields. Past work by Asaad et al., [1], showed that the nucleus of a single 123Sb atom can be integrated into a nanoelectronic device and be used to encode quantum information through Nuclear Electric Resonance. In this work, we demonstrate coherent magnetic control on a single implanted atom of 123Sb in a semiconductor nanostructure, which had not been realized before. The magnetic antenna allows us to reconstruct the full NMR and ESR spectrum, characterize the quadrupolar interaction and investigate the performance and sources of noise for both magnetic and electric coherent control. Thanks to their large Hilbert space, high-spin nuclei set the pathway for protected qubit encoding [2] and all-electrical control in single-atom semiconductor devices.

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

[2] Gross, J. A. Phys. Rev. Lett. 127(1), 010504 (2021).

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Presenters

  • Irene Fernández de Fuentes

    University of New South Wales

Authors

  • Irene Fernández de Fuentes

    University of New South Wales

  • Tim Botzem

    University of New South Wales, Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, UNSW Sydney, New South Wales 2052, Australia.

  • Fay E Hudson

    University of New South Wales, Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, UNSW Sydney, New South Wales 2052, Australia.

  • Kohei M Itoh

    Keio Univ, School of Fundamental Science and Technology, Keio University, Kohoku-ku, Yokohama, Japan., Keio University

  • Andrew S Dzurak

    University of New South Wales, Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, UNSW Sydney, New South Wales 2052, Australia.

  • Andrea Morello

    School of Electrical Engineering and Telecommunications, UNSW Sydney, Sydney NSW 2052, Australia, School of Electrical Engineering and Telecommunications, UNSW Sydney, University of New South Wales, Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, UNSW Sydney, New South Wales 2052, Australia.