Low-magnetic field single-spin qubit operation in isotopically enriched silicon

ORAL

Abstract

Single-spin qubit readout traditionally relies on selective tunneling to a neighboring reservoir. It requires sophisticated microwave engineering to deliver high-frequency qubit drives to the quantum chip from room-temperature electronics, which will be a challenge for scaling of a silicon-based quantum processor. Here we present an alternative scheme where we use high-fidelity Pauli spin blockade readout to enable single-spin qubit operation in a magnetic field as low as 150mT. We discover the qubits decohere faster in low magnetic fields due to the background (800 ppm) 29Si nuclear spins in the isotopically enriched substrate. A simulation modeling the nuclear spin induced qubit frequency fluctuation produced results consistent with our experimental data. This work indicates that further isotopic enrichment may be needed to achieve the high fidelities required for a scalable quantum processor.

*This research is funded by the Australian Research Council (CE170100012), the US Army Research Office (W911NF-17-10198), and, in part, by Silicon Quantum Computing Proprietary Limited.

–

Presenters

  • RUICHEN ZHAO

    • National Institute of Standards and Technology Boulder
    • NIST
    • University of New South Wales

Authors

  • RUICHEN ZHAO

    • National Institute of Standards and Technology Boulder
    • NIST
    • University of New South Wales

  • Tuomo Tanttu

    • University of New South Wales

  • Kuan Yen Tan

    • Aalto University

  • Bas Hensen

    • University of New South Wales

  • Kok Wai Chan

    • University of New South Wales

  • Jason Hwang

    • University of New South Wales

  • Ross Leon

    • University of New South Wales

  • Chih-Hwan Yang

    • University of New South Wales

  • Will Gilbert

    • University of New South Wales

  • Fay E. Hudson

    • UNSW Sydney
    • Univ of New South Wales
    • University of New South Wales

  • Kohei M Itoh

    • Keio University

  • Andrey Kiselev

    • HRL Laboratories

  • Thaddeus D Ladd

    • HRL Laboratories

  • Andrea Morello

    • Center for Quantum Computation and Communication Technology, University of New South Wales
    • UNSW Sydney
    • Univ of New South Wales
    • University of New South Wales

  • Arne Laucht

    • UNSW Sydney
    • University of New South Wales

  • Andrew Steven Dzurak

    • UNSW Sydney
    • Univ of New South Wales
    • University of New South Wales