Spin Qubits with Integrated millikelvin CMOS Control

ORAL

Abstract

A key virtue of spin qubits is their tiny submicron footprint, enabling billions of qubits to fit on a single silicon wafer. With each qubit requiring a handful of gate electrodes for control, however, a formidable challenge arises in the management of this extreme interconnect density. Monolithic integration of qubits with CMOS-based control circuits can potentially address this challenge, although the impact of heat and crosstalk on the qubits is likely to pose a significant risk to this approach. An alternate architecture1 leverages heterogeneous ‘chiplet’ style packaging in which the control circuits and qubits are proximal, but positioned on separate dies and wired-up using dense, lithographically defined interconnects at milli-kelvin temperatures. Here, we report the realization of a cryo-CMOS control architecture (based on 28 nm FDSOI) and benchmark its performance using silicon MOS-style electron spin qubits2. The fidelity of both single- and two-qubit gate operations acts to probe the impact of heat and noise arising from the cryo-CMOS control circuits. These results suggest that heterogeneous integration is a viable means of scaling-up the control interface of spin-based quantum processors.

1. Pauka, S.J., Das, K., Kalra, R. et al. A cryogenic CMOS chip for generating control signals for multiple qubits. Nat Electron 4, 64–70 (2021). https://doi.org/10.1038/s41928-020-00528-y

2. Veldhorst, M., Yang, C., Hwang, J. et al. A two-qubit logic gate in silicon. Nature 526, 410–414 (2015). https://doi.org/10.1038/nature15263

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Presenters

  • Samuel Bartee

    • University of Sydney

Authors

  • Samuel Bartee

    • University of Sydney

  • William Gilbert

    • University of New South Wales
    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia; Diraq Pty Ltd., Sydney, NSW, Australia

  • Kun Zuo

    • University of Sydney
    • ARC Centre of Excellence for Engineered Quantum Systems, School of Physics, The University of Sydney, Sydney, NSW, 2006
    • Riken Center for Quantum Computing (RQC)

  • Kushal Das

    • Microsoft Quantum Sydney, The University of Sydney
    • Microsoft Quantum Sydney, The University of Sydney, NSW 2006, Australia

  • Tuomo I Tanttu

    • 1) University of New South Wales 2) Diraq

  • Henry Yang

    • 1) University of New South Wales 2) Diraq
    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia; Diraq Pty Ltd., Sydney, NSW, Australia

  • Nard D Stuyck

    • University of New South Wales
    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia; Diraq Pty Ltd., Sydney, NSW, Australia

  • Rachpon Kalra

    • Microsoft Quantum Sydney, The University of Sydney
    • Microsoft Quantum Sydney, The University of Sydney, Sydney, NSW, 2006

  • Sebastian Pauka

    • Microsoft Quantum Sydney, The University of Sydney
    • Univ of Sydney

  • Rocky Y Su

    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia

  • Wee Han Lim

    • 1) University of New South Wales 2) Diraq
    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia; Diraq Pty Ltd., Sydney, NSW, Australia

  • Santiago Serrano

    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia; Diraq Pty Ltd., Sydney, NSW, Australia

  • Christopher Escott

    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia; Diraq Pty Ltd., Sydney, NSW, Australia

  • Fay E Hudson

    • 1) University of New South Wales, 2) Diraq Pty. Ltd.
    • School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, 2052, Australia; Diraq Pty Ltd., Sydney, NSW, Australia
    • (1) UNSW Sydney & (2) Diraq
    • University of New South Wales

  • Kohei M Itoh

    • Keio Univ

  • Arne Laucht

    • 1) University of New South Wales, 2) Diraq Pty. Ltd.

  • Andrew S Dzurak

    • (1) UNSW Sydney & (2) Diraq

  • David Reilly

    • Microsoft Quantum Sydney, The University of Sydney
    • Univ of Sydney