Planar superconducting whispering gallery mode resonators
Zlatko Minev, Ioan M. Pop, Michel Devoret
We introduce a microwave circuit architecture for quantum signal processing combining design principles borrowed from high-Q 3D resonators in the quantum regime and from planar structures fabricated with standard lithography. The resulting “2.5D” whispering-gallery mode resonators store 98% of their energy in vacuum. We have measured internal quality factors above 3 × 106 at the single photon level and have used the device as a materials’ characterization platform to place an upper bound on the surface resistance of thin film aluminum of less than 250 nΩ.
arXiv:1308.1743•Applied Physics Letters•Sep 30, 2013•23 citations