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 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 μs. We describe initial measurements of quasiparticle behavior and discuss the possible optimization and application of such detector devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 20, 2021
- Source ID
- 10.1063/5.0063445
Entities
People
- Azarin Zarassi
- D. M. Hartsell
- Eli Levenson-Falk
- Evangelos Vlachos
- Hongrui Zhang
- James T. Farmer
Organizations
- Air Force Office of Scientific Research
- Division of Materials Research
- University of Southern California