Destructive Little-Parks Effect in a Full-Shell Nanowire-Based Transmon

Deividas Sabonis, Oscar Erlandsson, Anders Kringhøj, Bernard Van Heck, Thorvald W. Larsen, Ivana Petkovic, Peter Krogstrup, Karl D. Petersson, Charles M. Marcus

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)
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A semiconductor transmon with an epitaxial Al shell fully surrounding an InAs nanowire core is investigated in the low EJ/EC regime. Little-Parks oscillations as a function of flux along the hybrid wire axis are destructive, creating lobes of reentrant superconductivity separated by a metallic state at a half quantum of applied flux. In the first lobe, phase winding around the shell can induce topological superconductivity in the core. Coherent qubit operation is observed in both the zeroth and first lobes. Splitting of parity bands by coherent single-electron coupling across the junction is not resolved beyond line broadening, placing a bound on Majorana coupling, EM/h<10 MHz, much smaller than the Josephson coupling EJ/h∼4.7 GHz.

Original languageEnglish
Article number156804
Number of pages5
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 2020


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