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

Year: 2022
Type: article
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.
Source: PRX Quantum
DOI: 10.1103/prxquantum.3.030311
Authors: Arno Bargerbos, Marta Pita-Vidal, Rok Žitko, Jesús Ávila, Lukas J. Splitthoff, Lukas Grünhaupt, Jaap J. Wesdorp, Christian K. Andersen, Yu Liu, Leo P. Kouwenhoven, Ramón Aguado, Angela Kou, Bernard van Heck
Institutions: QuTech, Delft University of Technology, University of Ljubljana, Jožef Stefan Institute, Consejo Superior de Investigaciones Científicas, Instituto de Ciencia de Materiales de Madrid, University of Copenhagen, University of Illinois Urbana-Champaign, Leiden University
Language: English
Open Access status: gold
Estimated APC paid: $3,450
Awards: G1268246865, G1650125035, Physics of quantum technologies, G2621168334, G3238023566, Coulombic subgap states in superconducting quantum devices, G480488906, G490073602, G4921735493, Solid state theory and statistical physics, G906136324
OpenAlex ID: W4221162262
FWCI: 6.686
Cites: 104
Cited by: 77
Related to: 10