Losses in coplanar waveguide resonators at millikelvin temperatures

Details Losses in coplanar waveguide resonators at millikelvin temperatures Losses in coplanar waveguide resonators at millikelvin temperatures

2009-10-05

arxiv.org/abs/0910.0685v2

Applied Physics Letters 96, 062503 (2010)

Physics

Condensed Matter

Superconductivity

3 pages, 5 figures, Submitted to Applied Physics Letters

Scientific paper

10.1063/1.3309754

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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