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Strong coupling between a microwave photon and a singlet-triplet qubit

Author

Listed:
  • J. H. Ungerer

    (University of Basel
    University of Basel)

  • A. Pally

    (University of Basel)

  • A. Kononov

    (University of Basel)

  • S. Lehmann

    (Lund University)

  • J. Ridderbos

    (University of Basel
    University of Twente)

  • P. P. Potts

    (University of Basel
    University of Basel)

  • C. Thelander

    (Lund University)

  • K. A. Dick

    (Lund University)

  • V. F. Maisi

    (Lund University)

  • P. Scarlino

    (Ecole Polytechnique Fédérale de Lausanne)

  • A. Baumgartner

    (University of Basel
    University of Basel)

  • C. Schönenberger

    (University of Basel
    University of Basel)

Abstract

Combining superconducting resonators and quantum dots has triggered tremendous progress in quantum information, however, attempts at coupling a resonator to even charge parity spin qubits have resulted only in weak spin-photon coupling. Here, we integrate a zincblende InAs nanowire double quantum dot with strong spin-orbit interaction in a magnetic-field resilient, high-quality resonator. The quantum confinement in the nanowire is achieved using deterministically grown wurtzite tunnel barriers. Our experiments on even charge parity states and at large magnetic fields, allow us to identify the relevant spin states and to measure the spin decoherence rates and spin-photon coupling strengths. We find an anti-crossing between the resonator mode in the single photon limit and a singlet-triplet qubit with a spin-photon coupling strength of g/2π = 139 ± 4 MHz. This coherent coupling exceeds the resonator decay rate κ/2π = 19.8 ± 0.2 MHz and the qubit dephasing rate γ/2π = 116 ± 7 MHz, putting our system in the strong coupling regime.

Suggested Citation

  • J. H. Ungerer & A. Pally & A. Kononov & S. Lehmann & J. Ridderbos & P. P. Potts & C. Thelander & K. A. Dick & V. F. Maisi & P. Scarlino & A. Baumgartner & C. Schönenberger, 2024. "Strong coupling between a microwave photon and a singlet-triplet qubit," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45235-w
    DOI: 10.1038/s41467-024-45235-w
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    References listed on IDEAS

    as
    1. X. Mi & M. Benito & S. Putz & D. M. Zajac & J. M. Taylor & Guido Burkard & J. R. Petta, 2018. "A coherent spin–photon interface in silicon," Nature, Nature, vol. 555(7698), pages 599-603, March.
    2. A. J. Landig & J. V. Koski & P. Scarlino & U. C. Mendes & A. Blais & C. Reichl & W. Wegscheider & A. Wallraff & K. Ensslin & T. Ihn, 2018. "Coherent spin–photon coupling using a resonant exchange qubit," Nature, Nature, vol. 560(7717), pages 179-184, August.
    3. F. Borjans & X. G. Croot & X. Mi & M. J. Gullans & J. R. Petta, 2020. "Resonant microwave-mediated interactions between distant electron spins," Nature, Nature, vol. 577(7789), pages 195-198, January.
    4. K. D. Petersson & L. W. McFaul & M. D. Schroer & M. Jung & J. M. Taylor & A. A. Houck & J. R. Petta, 2012. "Circuit quantum electrodynamics with a spin qubit," Nature, Nature, vol. 490(7420), pages 380-383, October.
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