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Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit

Author

Listed:
  • C. G. L. Bøttcher

    (Harvard University)

  • S. P. Harvey

    (Harvard University
    Stanford University)

  • S. Fallahi

    (Purdue University)

  • G. C. Gardner

    (Purdue University)

  • M. J. Manfra

    (Purdue University
    Purdue University
    Purdue University
    Purdue University)

  • U. Vool

    (Harvard University
    Harvard University)

  • S. D. Bartlett

    (The University of Sydney)

  • A. Yacoby

    (Harvard University)

Abstract

Coupling qubits to a superconducting resonator provides a mechanism to enable long-distance entangling operations in a quantum computer based on spins in semiconducting materials. Here, we demonstrate a controllable spin-photon coupling based on a longitudinal interaction between a spin qubit and a resonator. We show that coupling a singlet-triplet qubit to a high-impedance superconducting resonator can produce the desired longitudinal coupling when the qubit is driven near the resonator’s frequency. We measure the energy splitting of the qubit as a function of the drive amplitude and frequency of a microwave signal applied near the resonator antinode, revealing pronounced effects close to the resonator frequency due to longitudinal coupling. By tuning the amplitude of the drive, we reach a regime with longitudinal coupling exceeding 1 MHz. This mechanism for qubit-resonator coupling represents a stepping stone towards producing high-fidelity two-qubit gates mediated by a superconducting resonator.

Suggested Citation

  • C. G. L. Bøttcher & S. P. Harvey & S. Fallahi & G. C. Gardner & M. J. Manfra & U. Vool & S. D. Bartlett & A. Yacoby, 2022. "Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32236-w
    DOI: 10.1038/s41467-022-32236-w
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    References listed on IDEAS

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