Direct microwave measurement of Andreev-bound-state dynamics in a proximitized semiconducting nanowire

Abstract

The modern understanding of the Josephson effect in mesosopic devices derives from the physics of Andreev bound states, fermionic modes that are localized in a superconducting weak link. Recently, Josephson junctions constructed using semiconducting nanowires have led to the realization of superconducting qubits with gate-tunable Josephson energies. We have used a microwave circuit QED architecture to detect Andreev bound states in such a gate-tunable junction based on an aluminum-proximitized InAs nanowire. We demonstrate coherent manipulation of these bound states, and track the bound-state fermion parity in real time. Individual parity-switching events due to non-equilibrium quasiparticles are observed with a characteristic timescale $T_{\mathrm{parity}}=160\pm 10\mu \mathrm{s}$. The $T_{\mathrm{parity}}$ of a topological nanowire junction sets a lower bound on the bandwidth required for control of Majorana bound states.

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• Flip-chip-based microwave spectroscopy of Andreev bound states in a planar Josephson junction
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• Fermion-parity qubit in a proximitized double quantum dot
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• Andreev Modes from Phase Winding in a Full-shell Nanowire-based Transmon
• Quantum circuits with multiterminal Josephson-Andreev junctions
• Spin Coherent Manipulation in Josephson Weak Links
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• Energy spectrum and current-phase relation of a nanowire Josephson junction close to the topological transition
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• Hybrid superinductance with Al/InAs