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. © 2010 American Institute of Physics.
CITATION STYLE
Macha, P., Van Der Ploeg, S. H. W., Oelsner, G., Il’Ichev, E., Meyer, H. G., Wünsch, S., & Siegel, M. (2010). Losses in coplanar waveguide resonators at millikelvin temperatures. Applied Physics Letters, 96(6). https://doi.org/10.1063/1.3309754
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