Progress in exchange-based 2-qubit logic gates with donors in silicon

ORAL

Abstract

Donor spin qubits have been extensively studied for future applications in quantum computing. In top-down ion-implanted devices, coherence times as long as 30 seconds and gate fidelities beyond 99.9% have been demonstrated. Building on those achievements, we report on progress towards two-qubit operations mediated by exchange interactions. Newly fabricated devices with an increased implantation dose revealed a high number of donors in the vicinity of a single-electron transistor. Electron spin resonance (ESR) spectra show spectroscopic evidence of exchange-coupled donor pairs. Experiments are underway to demonstrate 2-qubit logic gates using state-conditional ESR pulses.

*Research funded by the Australian Research Council (CE11E0001027) and the US Army Research Office (W911NF-17-1-0200).

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Presenters

  • Mateusz Madzik

    • Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, University of New South Wales

Authors

  • Mateusz Madzik

    • Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, University of New South Wales

  • Arne Laucht

    • Center for Quantum Computation and Communication Technology, University of New South Wales
    • Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, University of New South Wales

  • Vincent Mourik

    • Center for Quantum Computation and Communication Technology, University of New South Wales
    • Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, University of New South Wales

  • Fay Hudson

    • Center for Quantum Computation and Communication Technology, University of New South Wales
    • Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, University of New South Wales

  • Kohei Itoh

    • School of Fundamental Science and Technology, Keio University

  • David Jamieson

    • Centre for Quantum Computation and Communication Technology, School of Physics, University of Melbourne

  • Andrew Dzurak

    • Center for Quantum Computation and Communication Technology, University of New South Wales
    • Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, University of New South Wales
    • The University of New South Wales
    • Univ of New South Wales
    • University of New South Wales

  • Andrea Morello

    • Center for Quantum Computation and Communication Technology, University of New South Wales
    • Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, University of New South Wales