2008/04/03 by Jiansong Gao, Miguel Daal, John M. Martinis +6 · 6 citations
Engineering · Physics and Astronomy · #Center (category theory) #Coplanar waveguide #Mechanical and Optical Resonators #Niobium #Noise (video) #Photonic and Optical Devices #Physics of Superconductivity and Magnetism #Resonator #Scaling #Superconductivity #Waveguide #cond-mat.supr-con
paper · pdf · doi:10.1063/1.2937855
3 figs
arxiv created 2008/04/03 · openalex publication_date 2008/05/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present measurements of the low-temperature excess frequency noise of four niobium superconducting coplanar waveguide microresonators, with center strip widths sr ranging from 3to20μm. For a fixed internal power, we find that the frequency noise decreases rapidly with increasing center strip width, scaling as 1∕sr1.6. We show that this geometrical scaling is readily explained by a simple semiempirical model which assumes a surface distribution of independent two-level system fluctuators. These results allow the resonator geometry to be optimized for minimum noise.