Trapping a single vortex and reducing quasiparticles in a superconducting resonator

I. Nsanzineza, B. L.T. Plourde

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


Vortices trapped in thin-film superconducting microwave resonators can have a significant influence on the resonator performance. Using a variable-linewidth geometry for a weakly coupled resonator, we are able to observe the effects of a single vortex trapped in the resonator through field cooling. For resonant modes where the vortex is near a current antinode, the presence of even a single vortex leads to a measurable decrease in the quality factor and a dispersive shift of the resonant frequency. For modes with the vortex located at a current node, the presence of the vortex results in no detectable excess loss and, in fact, produces an increase in the quality factor. We attribute this enhancement to a reduction in the density of nonequilibrium quasiparticles in the resonator due to their trapping and relaxation near the vortex core.

Original languageEnglish (US)
Article number117002
JournalPhysical Review Letters
Issue number11
StatePublished - Sep 12 2014

ASJC Scopus subject areas

  • General Physics and Astronomy


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