Continuous Real-Time Detection of Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions

Abstract

Nonequilibrium quasiparticles are ubiquitous in superconducting electronics. These quasiparticles can trap in the internal Andreev bound states of a phase-biased Josephson junction, providing a mechanism for studying their presence and behavior. We characterize a quasiparticle trapping detector device based on a two-junction aluminum nanobridge superconducting quantum interference device incorporated into a transmission-line resonator. When flux-biased, distinct resonant frequencies develop depending on the trapped quasiparticle number. We demonstrate continuous detection of up to 3 trapped quasiparticles, with detection of a trapped quasiparticle with signal-to-noise ratio of 27 in 5 $\mu$s. We describe initial measurements of quasiparticle behavior and discuss the possible optimization and application of such detector devices.

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Cited by in corpus (4)

• Dynamical polarization of the fermion parity in a nanowire Josephson junction
• Quasiparticle dynamics in epitaxial Al-InAs planar Josephson junctions
• A Review of Design Concerns in Superconducting Quantum Circuits
• Electron-phonon interactions in the Andreev Bound States of aluminum nanobridge Josephson junctions