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.
Observation of vanishing charge dispersion of a nearly open superconducting island / Bargerbos, Arno; Uilhoorn, Willemijn; Yang, Chung-Kai; Krogstrup, Peter; Kouwenhoven, Leo P; de Lange, Gijs; van Heck, Bernard; Kou, Angela. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 124:24(2020). [10.1103/PhysRevLett.124.246802]
Observation of vanishing charge dispersion of a nearly open superconducting island
van Heck, BernardPenultimo
;
2020
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.File | Dimensione | Formato | |
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