We report a reduction in 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 resonators. The reduction is additive to decreasing the noise by widening the resonators.
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; Reduced frequency noise in superconducting resonators. Appl. Phys. Lett. 19 July 2010; 97 (3): 033507. https://doi.org/10.1063/1.3467052
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