Reduced frequency noise in superconducting resonators
R. Barends, N. Vercruyssen, A. Endo, P. J. de Visser, T. Zijlstra, T., M. Klapwijk, J. J. A. Baselmans
TL;DR
This paper demonstrates a significant reduction in frequency noise in superconducting resonators by surface treatment and material choice, enhancing their stability for quantum applications.
Contribution
It introduces a novel method combining substrate removal and NbTiN use to reduce noise, supported by experimental and model analysis.
Findings
7 dB noise reduction achieved
Surface of NbTiN is a negligible noise source
Reduction additive to resonator widening
Abstract
We report a reduction of the frequency noise in coplanar waveguide superconducting resonators. The reduction of 7 dB is achieved by removing the exposed dielectric substrate surface from the region with high electric fields and by using NbTiN. In a model-analysis the surface of NbTiN is found to be a negligible source of noise, experimentally supported by a comparison with NbTiN on SiOx resonators. The reduction is additive to decreasing the noise by widening the resonators.
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