Improving the performance of superconducting microwave resonators in magnetic fields

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.

References in corpus (7)

• Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• High cooperativity coupling of electron-spin ensembles to superconducting cavities
• Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity
• Microwave response of vortices in superconducting thin films of Re and Al
• Minimal resonator loss for circuit quantum electrodynamics
• Cavity QED with an ultracold ensemble on a chip: prospects for strong magnetic coupling at finite temperatures

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