Journal
APPLIED PHYSICS LETTERS
Volume 119, Issue 12, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0063445
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Funding
- AFOSR YIP [FA9550-19-1-0060]
- NSF DMR [DMR-1900135]
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This study presents a quasiparticle trapping detector device based on a superconducting quantum interference device, capable of continuously detecting multiple trapped quasiparticles with distinct resonant frequencies depending on the number of trapped quasiparticles.
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 the device is 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 a 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.& nbsp;Published under an exclusive license by AIP Publishing.
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