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Reduced frequency noise in superconducting resonators

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arxiv 1005.5394 v1 pith:VSTA4VGM submitted 2010-05-28 cond-mat.mes-hall cond-mat.supr-con

R. Barends , N. Vercruyssen , A. Endo , P. J. de Visser , T. Zijlstra , T. M. Klapwijk , J. J. A. Baselmans This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.supr-con
keywords noiseresonatorsnbtinreductionfrequencysuperconductingsurfaceachieved
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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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