Loss mechanisms in superconducting thin film microwave resonators

  title={Loss mechanisms in superconducting thin film microwave resonators},
  author={Jan Goetz and Frank Deppe and Max Haeberlein and Friedrich Wulschner and Christoph W. Zollitsch and Sebastian B. Meier and Michael Fischer and P Eder and Edwar Xie and Kirill G Fedorov and Edwin P. Menzel and Achim Marx and Rudolf Gross},
  journal={arXiv: Superconductivity},
We present a systematic analysis of the internal losses of superconducting coplanar waveguide microwave resonators based on niobium thin films on silicon substrates. In particular, we investigate losses introduced by Nb/Al interfaces in the center conductor, which is important for experiments where Al based Josephson junctions are integrated into Nb based circuits. We find that these interfaces can be a strong source for two-level state (TLS) losses, when the interfaces are not positioned at… 

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