Losses in coplanar waveguide resonators at millikelvin temperatures

Macha, P.; van der Ploeg, S. H. W.; Oelsner, G.; Il'ichev, E.; Meyer, H.-G.; Wünsch, S.; Siegel, M.
February 2010
Applied Physics Letters;2/8/2010, Vol. 96 Issue 6, p062503
Academic Journal
We study the loss rate for a set of λ/2 coplanar waveguide resonators at millikelvin temperatures (20–900 mK) and different applied powers (3·10-19–10-12 W). The loss rate becomes power independent below a critical power. For a fixed power, the loss rate increases significantly with decreasing temperature. We show that this behavior can be caused by two-level systems in the surrounding dielectric materials. Interestingly, the influence of the two-level systems is of the same order of magnitude for the different material combinations. That leads to the assumption that the nature of these two-level systems is material independent.


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