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

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)
65 Downloads (Pure)


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.

Original languageEnglish
Article number246802
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 2020


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