Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 58: Superconductivity: Qubits 2
TT 58.2: Talk
Thursday, April 4, 2019, 15:15–15:30, Theater
Al based microwave resonators in the clean and dirty limit — •Karthik Bharadwaj1,2, Farshad Foroughi1,2, Remy Dassonneville1,2, Luca Planat1,2, Sebastien Leger1,2, Jovian Delaforce1,2, Valdmir Milchakov1,2, Cecile Naud1, Olivier Buisson1, Nicolas Roch1, and Wiebke Hasch-Guichard1,2 — 1Univ. Grenoble Alpes, F-38000 Grenoble France — 2Institut Neel, CNRS, F-38000 Grenoble France
Resonators have become a very important part superconducting Circuit QED. And they are an excellent candidate to understand the dissipation sources in qubit systems. We present a comparative experimental study of the internal quality factor of Al based microwave resonators. Microwave resonators with a typical frequency of 4GHz have been fabricated with different film thicknesses. We have developed a new fabrication technique to fabricate microwave resonators having a film thickness of around 6microns. For these film thicknesses Al turns into a clean type 1 superconductor. The behavior of the internal quality factor as a function of applied microwave power is discussed as well as the limiting dissipation mechanism of each resonator.