Reduced frequency noise in superconducting resonators

Barends, R.; Vercruyssen, N.; Endo, A.; de Visser, P. J.; Zijlstra, T.; Klapwijk, T. M.; Baselmans, J. J. A.
July 2010
Applied Physics Letters;7/19/2010, Vol. 97 Issue 3, p033507
Academic Journal
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 SiOx resonators. The reduction is additive to decreasing the noise by widening the resonators.


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