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.
@article{arxiv.0910.0685,
title = {Losses in coplanar waveguide resonators at millikelvin temperatures},
author = {P. Macha and S. H. W. van der Ploeg and G. Oelsner and E. Il'ichev and H. -G. Meyer and S. Wuensch and M. Siegel},
journal= {arXiv preprint arXiv:0910.0685},
year = {2010}
}
Comments
3 pages, 5 figures, Submitted to Applied Physics Letters