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arXiv · 1911.10010

Observation of vanishing charge dispersion of a nearly-open superconducting island

Arno Bargerbos·Willemijn Uilhoorn·Chung-Kai Yang·Peter Krogstrup·Leo P. Kouwenhoven·Gijs de Lange·Bernard van Heck·Angela Kou
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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.

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Arno Bargerbos, Willemijn Uilhoorn, Chung-Kai Yang, Peter Krogstrup, Leo P. Kouwenhoven, Gijs de Lange, Bernard van Heck, Angela Kou. 2020-02-28. Observation of vanishing charge dispersion of a nearly-open superconducting island. https://doi.org/10.1103/physrevlett.124.246802

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