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29 March 2024
 
  » arxiv » 0910.0685

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Losses in coplanar waveguide resonators at millikelvin temperatures
P. Macha ; S.H.W. van der Ploeg ; G. Oelsner ; E. Il'ichev ; H.-G. Meyer ; S. Wuensch ; M. Siegel ;
Date 5 Oct 2009
AbstractWe study the loss rate for a set of lambda/2 coplanar waveguide resonators at millikelvin temperatures (20 mK - 900 mK) and different applied powers (3E-19 W - 1E-12 W). It was found that 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 used in this work. This leads to the assumption that the nature of these two-level systems is material independent.
Source arXiv, 0910.0685
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