Sergey Frolov: Sn-InAs nanowire based superconducting qubit

"Sn-InAs nanowire based superconducting qubit"

Abstract: With larger induced superconducting gap and high magnetic field resilience[1], Tin (Sn)-based hybrid superconductor-semiconductor nanowire Josephson junctions have recently exhibited superior performance in DC transport measurements. They are emerging as an alternative to Aluminum for hybrid superconductor-semiconductor studies. In this context, we aim to advance the field by utilizing Sn-based nanowire junctions to create superconducting qubits. We demonstrate transmon qubits using Sn-InAs nanowire Josephson junctions with microsecond coherence times and reduced anharmonicity compared to conventional AlOx based transmons. We examine how the interface between superconducting leads and Tin (Sn) influence the coherence times of these nanowire-based qubits and discuss ways to improve it. [1] M. Pendharkar., et al., Science 372, 508(2021)