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arXiv · 1101.3185

Improving the performance of superconducting microwave resonators in magnetic fields

Daniel Bothner·Tobias Gaber·Matthias Kemmler·Dieter Koelle·Reinhold Kleiner
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Abstract

The operation of superconducting coplanar waveguide cavities, as used for circuit quantum electrodynamics and kinetic inductance detectors, in perpendicular magnetic fields normally leads to a reduction of the device performance due to energy dissipating Abrikosov vortices. We experimentally investigate the vortex induced energy losses in such Nb resonators with different spatial distributions of micropatterned pinning sites (antidots) by transmission spectroscopy measurements at 4.2 K. In comparison to resonators without antidots we find a significant reduction of vortex induced losses and thus increased quality factors over a broad range of frequencies and applied powers in moderate fields.

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Daniel Bothner, Tobias Gaber, Matthias Kemmler, Dieter Koelle, Reinhold Kleiner. 2011-01-17. Improving the performance of superconducting microwave resonators in magnetic fields. https://doi.org/10.1063/1.3560480

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