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arXiv · 2107.07125

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

James T. Farmer·Azarin Zarassi·Darian M. Hartsell·Evangelos Vlachos·Haimeng Zhang·Eli M. Levenson-Falk
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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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James T. Farmer, Azarin Zarassi, Darian M. Hartsell, Evangelos Vlachos, Haimeng Zhang, Eli M. Levenson-Falk. 2021-07-15. Continuous Real-Time Detection of Quasiparticle Trapping in Aluminum Nanobridge Josephson Junctions. https://doi.org/10.1063/5.0063445

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