Design of superconducting transmission line integrated surface-electrode ion-traps

Abstract

We fabricated superconducting surface electrode ion traps with integrated microwave coplanar waveguides using direct-write optical lithography and a niobium on sapphire process. We then tested these traps in a closed cycle cryostat and used 28 mW of microwave power to excite rotational transitions of trapped strontium chloride molecular ions. We expected that driving these rotational transitions would heat a co-trapped strontium atomic ion cloud. However, we did not see this heating and we must conduct further experiments.