2012/10/31 by Jonathan Burnett, Tobias Lindström, Mark Oxborrow +4 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.87.140501
published as J. Burnett et al. Phys. Rev. B 87, 140501(R) (2013) [5 pages] · 4 pages, 2 figures, version 4 http://prb.aps.org/abstract/PRB/v87/i14/e140501
arxiv created 2013/04/09 · arxiv updated 2013/04/10
Slow noise processes, with characteristic timescales ~1s, have been studied in planar superconducting resonators. A frequency locked loop is employed to track deviations of the resonator centre frequency with high precision and bandwidth. Comparative measurements are made in varying microwave drive, temperature and between bare resonators and those with an additional dielectric layer. All resonators are found to exhibit flicker frequency noise which increases with decreasing microwave drive. We also show that an increase in temperature results in a saturation of flicker noise in resonators with an additional dielectric layer, while bare resonators stop exhibiting flicker noise instead showing a random frequency walk process.