Observation of Vanishing Charge Dispersion of a Nearly Open Superconducting Island
Arno Bargerbos (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
Willemijn Uilhoorn (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Chung Kai Yang (TU Delft - QRD/Kouwenhoven Lab, Microsoft Quantum Lab Delft)
Peter Krogstrup (University of Copenhagen)
Leo P. Kouwenhoven (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QN/Kouwenhoven Lab)
Gijs De Lange (TU Delft - QRD/Kouwenhoven Lab, Microsoft Quantum Lab Delft)
Bernard Van Heck (TU Delft - QRD/Kouwenhoven Lab, Microsoft Quantum Lab Delft)
Angela Kou (TU Delft - QN/vanderSarlab, Microsoft Quantum Lab Delft)
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Abstract
Isolation from the environment determines the extent to which charge is confined on an island, which manifests as Coulomb oscillations, such as charge dispersion. We investigate the charge dispersion of a nanowire transmon hosting a quantum dot in the junction. We observe rapid suppression of the charge dispersion with increasing junction transparency, consistent with the predicted scaling law, which incorporates two branches of the Josephson potential. We find improved qubit coherence times at the point of highest suppression, suggesting novel approaches for building charge-insensitive qubits.