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

• URL: http://arxiv.org/abs/2107.07125v2
• Date: Fri, 3 Sep 2021 18:22:31 GMT
• Title: Continuous Real-Time Detection of Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions
• Authors: James T. Farmer, Azarin Zarassi, Darian M. Hartsell, Evangelos Vlachos, Haimeng Zhang, Eli M. Levenson-Falk
• Abstract summary: Nonequilibrium quasiparticles are ubiquitous in superconducting electronics. We characterize a quasiparticle trapping detector device based on a two-junction aluminum nanobridge superconducting quantum interference device incorporated into a transmission-line resonator. 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.
• Score: 5.912792105701256
• License: http://creativecommons.org/publicdomain/zero/1.0/
• 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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