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Anodic Oxidation of Epitaxial Superconductor-Semiconductor Hybrids
Asbjørn C. C. Drachmann, Rosa E. Diaz, Candice Thomas +10
We demonstrate a new fabrication process for hybrid semiconductor-superconductor heterostructures based on anodic oxidation (AO), allowing controlled thinning of epitaxial Al films…
Andreev Modes from Phase Winding in a Full-shell Nanowire-based Transmon
A. Kringhøj, G. W. Winkler, T. W. Larsen +6
We investigate transmon qubits made from semiconductor nanowires with a fully surrounding superconducting shell. In the regime of reentrant superconductivity associated with the de…
Quantum-Dot Parity Effects in Trivial and Topological Josephson Junctions
D. Razmadze, E. C. T. O'Farrell, P. Krogstrup +1
An odd-occupied quantum dot in a Josephson junction can flip transmission phase, creating a π-junction. When the junction couples topological superconductors, no phase flip is expe…
Destructive Little-Parks Effect in a Full-Shell Nanowire-based Transmon
Deividas Sabonis, Oscar Erlandsson, Anders Kringhøj +6
A semiconductor transmon with an epitaxial Al shell fully surrounding an InAs nanowire core is investigated in the low regime. Little-Parks oscillations as a function of…
Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires
S. Vaitiekėnas, Y. Liu, P. Krogstrup +1
We report transport measurements and tunneling spectroscopy in hybrid nanowires with epitaxial layers of superconducting Al and the ferromagnetic insulator EuS, grown on semiconduc…
A Parity-Protected Superconductor-Semiconductor Qubit
T. W. Larsen, M. E. Gershenson, L. Casparis +7
Coherence of superconducting qubits can be improved by implementing designs that protect the parity of Cooper pairs on superconducting islands. Here, we introduce a parity-protecte…