Engineering hyperfine Stark shifts for addressable high-speed gates in donor molecules in silicon

ORAL

Abstract

Electron and nuclear spin qubits on single donor atoms in silicon have demonstrated long coherence times with high fidelities. Recent results have demonstrated the ability to form fast (0.8ns) two qubit gates using donor molecules in silicon. Scalable quantum computer architectures require the ability to combine fast single and two qubit gates with individual qubit addressability across an array to minimise errors on neighbouring qubits. Single donor qubits require a large ~30MHz/MVm-1 hyperfine Stark shift of the qubit resonance frequency to uniquely address identical single donor nuclear spins. Previous results on single phosphorus donor spins have measured a hyperfine Stark coefficient of 0.34MHz/MVm-1, well below that identified in the Kane architecture thereby limiting the speed of addressable quantum gates. By comparing experimental results of donor molecules in silicon with tight binding simulations of 2P molecules we demonstrate atomic engineering of donor qubits in silicon to control a large range of hyperfine Stark coefficients (up to 72MHz/MVm-1). We discuss how these results can be extended to achieving high speed gates using electrically driven spin resonance control.

*The research was supported by the Australian Research Council Centre ofExcellence for Quantum Computation and Communication Technology (projectnumber CE170100012), the US Army Research Office under contract numberW911NF-17-1-0202 and Silicon Quantum Computing Pty Ltd. M.Y.S.acknowledges an Australian Research Council Laureate Fellowship.

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Publication: Engineering hyperfine Stark shifts for addressable high-speed gates in donor molecules in silicon (in preparation)
Michael T. Jones, Yu-Ling Hsueh, Felix N. Krauth, Pascal Macha, Serajum Monir Angus Worrall, Yousun Chung, Joris G. Keizer, Matthew G. House, Rajib Rahman, Michelle Y. Simmons

Presenters

  • Michael T Jones

    • University of New South Wales

Authors

  • Michael T Jones

    • University of New South Wales

  • Yu-ling Hsueh

    • University of New South Wales

  • Felix N Krauth

    • University of New South Wales

  • Pascal Macha

    • University of New South Wales
    • Silicon Quantum Computing Pty Ltd., Level 2, Newton Building, UNSW Sydney, Kensington, NSW 2052, Australia

  • Serjaum S Monir

    • University of New South Wales
    • UNSW Sydney
    • Centre of Excellence for Quantum Computation and Communication Technology, School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia

  • Angus Worrall

    • University of New South Wales

  • Yousun Chung

    • University of New South Wales
    • Silicon Quantum Computing Pty Ltd., Level 2, Newton Building, UNSW Sydney, Kensington, NSW 2052, Australia

  • Joris G Keizer

    • University of New South Wales
    • Silicon Quantum Computing Pty Ltd., Level 2, Newton Building, UNSW Sydney, Kensington, NSW 2052, Australia

  • Matthew G House

    • University of New South Wales

  • Rajib Rahman

    • University of New South Wales
    • Silicon Quantum Computing Pty Ltd., Level 2, Newton Building, UNSW Sydney, Kensington, NSW 2052, Australia

  • Michelle Y Simmons

    • University of New South Wales
    • Silicon Quantum Computing Pty Ltd., Level 2, Newton Building, UNSW Sydney, Kensington, NSW 2052, Australia; Centre of Excellence for Quantum Computation and Communication Tec