Coherent electrical control of an electron-nuclear flip-flop qubit in silicon

ORAL

Abstract

Donors in silicon provide a well-established platform for highly coherent spin qubits. Operated as individual electron or nuclear spin qubits, coherent control requires oscillating magnetic fields which are challenging to generate locally and result in slow qubit drive. Encoding quantum information in the combined anti-parallel electron-nuclear flip-flop states instead, allows for electrical control as the hyperfine interaction becomes susceptible to electric fields when displacing the electron away from the donor nucleus. Contrary to magnetic fields, local electric fields can be generated straightforwardly by leveraging existing gate electrodes. Here, we present coherent electric control of an implanted Phosphorus flip-flop qubit via hyperfine-modulated electric dipole spin resonance (EDSR). The electric drive leads to a Rabi frequency of up to 117.7 kHz, 5 times faster than traditional nuclear magnetic resonance techniques. We discuss coherence times and benchmark the control fidelities of the flip-flop qubit. The electric drive mechanism is applicable to both, top-down and bottom-up donor devices, and in combination with nuclear electric resonance offers a pathway to all-electrical control in donor-based quantum processors.

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Presenters

  • 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.

Authors

  • 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.

  • Rostyslav Savytskyy

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

  • Irene Fernandez De Fuentes

    • 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

  • David N Jamieson

    • School of Physics, University of Melbourne, Parkville VIC 3010, Australia
    • University of Melbourne
    • School of Physics, University of Melbourne, Melbourne, VIC 3010, 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.

  • 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.