Losses in coplanar waveguide resonators at millikelvin temperatures

  • Macha P
  • Van Der Ploeg S
  • Oelsner G
 et al. 
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Abstract

We study the loss rate for a set of lambda/2 coplanar waveguide resonators at millikelvin temperatures (20 mK - 900mK) and different applied powers (3E-19 W - 1E-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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Authors

  • P. Macha

  • S. H W Van Der Ploeg

  • G. Oelsner

  • E. Il'Ichev

  • H. G. Meyer

  • S. Wünsch

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