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Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits

Author

Listed:
  • Holly G. Stemp

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology)

  • Serwan Asaad

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology
    Quantum Machines)

  • Mark R. van Blankenstein

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology)

  • Arjen Vaartjes

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology)

  • Mark A. I. Johnson

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology
    Quantum Motion)

  • Mateusz T. Mądzik

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology
    Intel Corporation Hillsboro)

  • Amber J. A. Heskes

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology
    University of Twente)

  • Hannes R. Firgau

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology)

  • Rocky Y. Su

    (UNSW Sydney)

  • Chih Hwan Yang

    (UNSW Sydney
    Diraq Pty. Ltd.)

  • Arne Laucht

    (UNSW Sydney
    Diraq Pty. Ltd.)

  • Corey I. Ostrove

    (Sandia National Laboratories)

  • Kenneth M. Rudinger

    (Sandia National Laboratories)

  • Kevin Young

    (Sandia National Laboratories)

  • Robin Blume-Kohout

    (Sandia National Laboratories)

  • Fay E. Hudson

    (UNSW Sydney
    Diraq Pty. Ltd.)

  • Andrew S. Dzurak

    (UNSW Sydney
    Diraq Pty. Ltd.)

  • Kohei M. Itoh

    (Keio University, Kohoku-ku)

  • Alexander M. Jakob

    (ARC Centre of Excellence for Quantum Computation and Communication Technology
    University of Melbourne)

  • Brett C. Johnson

    (RMIT University)

  • David N. Jamieson

    (ARC Centre of Excellence for Quantum Computation and Communication Technology
    University of Melbourne)

  • Andrea Morello

    (UNSW Sydney
    ARC Centre of Excellence for Quantum Computation and Communication Technology)

Abstract

Scalable quantum processors require high-fidelity universal quantum logic operations in a manufacturable physical platform. Donors in silicon provide atomic size, excellent quantum coherence and compatibility with standard semiconductor processing, but no entanglement between donor-bound electron spins has been demonstrated to date. Here we present the experimental demonstration and tomography of universal one- and two-qubit gates in a system of two weakly exchange-coupled electrons, bound to single phosphorus donors introduced in silicon by ion implantation. We observe that the exchange interaction has no effect on the qubit coherence. We quantify the fidelity of the quantum operations using gate set tomography (GST), and we use the universal gate set to create entangled Bell states of the electrons spins, with fidelity 91.3 ± 3.0%, and concurrence 0.87 ± 0.05. These results form the necessary basis for scaling up donor-based quantum computers.

Suggested Citation

  • Holly G. Stemp & Serwan Asaad & Mark R. van Blankenstein & Arjen Vaartjes & Mark A. I. Johnson & Mateusz T. Mądzik & Amber J. A. Heskes & Hannes R. Firgau & Rocky Y. Su & Chih Hwan Yang & Arne Laucht , 2024. "Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52795-4
    DOI: 10.1038/s41467-024-52795-4
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