Microwave spectroscopy of Andreev states in InAs nanowire-based hybrid junctions using a flip-chip layout

Abstract

Josephson junctions based on semiconductor nanowires are potential building blocks for electrically tunable qubit structures, e.g. the gatemon or the Andreev qubit. However, an actual realization requires the thorough investigation of the intrinsic excitation spectrum. Here, we demonstrate the fabrication of low-loss superconducting microwave circuits that combine high quality factors with a well-controlled gate architecture by utilizing a flip-chip approach. This platform is then used to perform single-tone and two-tone experiments on Andreev states in in-situ grown InAs/Al core/half-shell nanowires with shadow mask defined Josephson junctions. In gate-controlled and flux-biased spectroscopic measurements we find clear signatures of single quasiparticle as well as quasiparticle pair transitions between discrete Andreev bound states mediated by photon-absorption. Our experimental findings are supported by simulations that show that the junction resides in the intermediate channel length regime.

11 pages, 6 figures

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Cited by in corpus (16)

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• Controllable Andreev Bound States in Bilayer Graphene Josephson Junction from Short to Long Junction Limits
• Nonequilibrium Fractional Josephson Effect
• Flip-chip-based fast inductive parity readout of a planar superconducting island
• Phase jumps in Josephson junctions with time-dependent spin-orbit coupling
• Signatures of Kondo-Majorana interplay in ac response
• Microwave Andreev bound state spectroscopy in a semiconductor-based Planar Josephson junction
• Exploring the energy spectrum of a four-terminal Josephson junction: Towards topological Andreev band structures
• Approaching the ultrastrong coupling regime between an Andreev level and a microwave resonator
• Gate-tunable negative differential conductance in hybrid semiconductor-superconductor devices
• Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations in the quasi-ballistic regime in phase-pure GaAs/InAs core/shell nanowires
• Finite Length Effects and Coulomb Interaction in Ge Quantum Well-Based Josephson Junctions Probed with Microwave Spectroscopy
• Effects of electron-electron interaction and spin-orbit coupling on Andreev pair qubits in quantum dot Josephson junctions