Utilization of the superconducting transition for characterizing low-quality-factor superconducting resonators

Yu Cheng Chang, Bayan Karimi, Jorden Senior, Alberto Ronzani, Joonas T. Peltonen, Hsi Sheng Goan, Chii Dong Chen, Jukka P. Pekola

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Abstract

Characterizing superconducting microwave resonators with highly dissipative elements is a technical challenge, but a requirement for implementing and understanding the operation of hybrid quantum devices involving dissipative elements, e.g., for thermal engineering and detection. We present experiments on λ/4 superconducting niobium coplanar waveguide resonators, terminating at the antinode by a dissipative copper microstrip via aluminum leads, such that the resonator response is difficult to measure in a typical microwave environment. By measuring the transmission both above and below the superconducting transition of aluminum, we are able to isolate the resonance. We then experimentally verify this method with copper microstrips of increasing thicknesses, from 50 nm to 150 nm, and measure quality factors in the range of 10-67 in a consistent way.

Original languageEnglish
Article number022601
JournalApplied Physics Letters
Volume115
Issue number2
DOIs
Publication statusPublished - 8 Jul 2019
MoE publication typeA1 Journal article-refereed

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