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Singlet-Doublet Transitions of a Quantum Dot Josephson Junction Detected in a Transmon Circuit

Journal Article (2022)
Author(s)

Arno Bargerbos (TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

Marta Pita-Vidal (TU Delft - QRD/Kouwenhoven Lab)

Lukas J. Splitthoff (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)

Lukas Grünhaupt (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

Jaap J. Wesdorp (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)

Christian K. Andersen (TU Delft - Andersen Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

Yu Liu (University of Copenhagen)

Leo P. Kouwenhoven (TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

Bernard Van Heck (Universiteit Leiden)

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DOI related publication
https://doi.org/10.1103/PRXQuantum.3.030311 Final published version
More Info
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Publication Year
2022
Language
English
Issue number
3
Volume number
3
Article number
030311
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Abstract

We realize a hybrid superconductor-semiconductor transmon device in which the Josephson effect is controlled by a gate-defined quantum dot in an InAs-Al nanowire. Microwave spectroscopy of the transition spectrum of the transmon allows us to probe the ground-state parity of the quantum dot as a function of the gate voltages, the external magnetic flux, and the magnetic field applied parallel to the nanowire. The measured parity phase diagram is in agreement with that predicted by a single-impurity Anderson model with superconducting leads. Through continuous-time monitoring of the circuit, we furthermore resolve the quasiparticle dynamics of the quantum dot Josephson junction across the phase boundaries. Our results can facilitate the realization of semiconductor-based 0-π qubits and Andreev qubits.