Advancements in 3D cavity fabrication and design for improved multimode quantum memories*

Superconducting multimode cavities can provide a hardware efficient means for quantum information storage and processing. To increase mode density, reduce cross-talk, and increase gate fidelities, it is important to build cavities with tailored mode spacing and very long coherence times. In this talk we present advances in materials processing and design of 3D microwave resonators to increase mode lifetimes beyond that of state-of-the-art aluminum cavities. This includes moving to higher Tc superconductors and quantifying the efficacy of various surface treatment procedures in reducing dissipative loss mechanisms. In doing so we will present a pathway for developing these cavities into novel 3D multimode architectures for next-generation randomly accessible quantum memories and processors.