Optimized Coplanar Waveguide Resonators for a Superconductor-Atom Interface

Abstract

We describe the design and characterization of superconducting coplanar waveguide cavities tailored to facilitate strong coupling between superconducting quantum circuits and single trapped Rydberg atoms. For initial superconductor-atom experiments at 4.2 K, we show that resonator quality factors above $10^4$ can be readily achieved. Furthermore, we demonstrate that the incorporation of thick-film copper electrodes at a voltage antinode of the resonator provides a route to enhance the zero-point electric fields of the resonator in a trapping region that is 40 $\mu$m above the chip surface, thereby minimizing chip heating from scattered trap light. The combination of high resonator quality factor and strong electric dipole coupling between the resonator and the atom should make it possible to achieve the strong coupling limit of cavity quantum electrodynamics with this system.

4 pages, 4 figures

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• Reducing Rydberg state dc polarizability by microwave dressing
• On-chip quantum tomography of mechanical nano-scale oscillators with guided Rydberg atoms
• Strong coupling and active cooling in a finite temperature hybrid atom-cavity system
• A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms
• Quantum theory of an atom in proximity to a superconductor
• Improving the accuracy of circuit quantization using the electromagnetic properties of superconductors