Losses in coplanar waveguide resonators at millikelvin temperatures

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 d...

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Bibliographic Details
Published in:Applied physics letters 2010-02, Vol.96 (6), p.062503-062503-3
Main Authors: Macha, P., van der Ploeg, S. H. W., Oelsner, G., Il'ichev, E., Meyer, H.-G., Wünsch, S., Siegel, M.
Format: Article
Language:English
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3309754