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  • Ungerer, J. H., et al. (author)
  • Strong coupling between a microwave photon and a singlet-triplet qubit
  • 2024
  • In: Nature Communications. - 2041-1723. ; 15:1
  • Journal article (peer-reviewed)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.
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Type of publication
journal article (1)
Type of content
peer-reviewed (1)
Author/Editor
Lehmann, S (1)
Maisi, V. F. (1)
Baumgartner, A. (1)
Schönenberger, C. (1)
Thelander, C. (1)
Dick, K. A. (1)
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Ungerer, J. H. (1)
Pally, A. (1)
Kononov, A. (1)
Ridderbos, J. (1)
Potts, P. P. (1)
Scarlino, P. (1)
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University
Lund University (1)
Language
English (1)
Research subject (UKÄ/SCB)
Natural sciences (1)
Year
2024 (1)

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