Composite superconductor materials for high quality resonators

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High-quality superconductors are critical to the superconducting quantum computing technologies. Because of their extremely low loss, they are widely used as the core components to store and transfer quantum information coherently. While many superconductors have been attempted, the existing knowledge is quit limited to exploring single materials up to now. We propose to use composite heteroepitaxial materials to construct superconductor resonators with higher-quality factors. The material system has a sandwich structure: the center layer having higher critical field and critical temperature, but they tend to have poor performance for microwave transmission; the top and bottom surface layers are formed with materials with demonstrated high-Q microwave performance, but they tend to have poor field performances. Combined together, microwave signals flow on the surfaces due to skin effect, and the surface layers are enhanced due to proximity effect. The composite system thus can outperform each of the individual components alone. The developed technology will further strengthen Canada's leading role in the quantum computing industries.