**Summary**

High quality factor cavities can be powerful control elements for ensembles of spins, enabling unitary control as well as on demand cooling. They can also be used to couple two otherwise non-interacting ensembles. The goal of the project is to explore the physics and engineering of such systems both theoretically and experimentally. The laboratory contains a uniquely configured dilution refrigerator that has two volumes at the base temperature: one in a magnetic field and one in near zero magnetic field. This allows superconducting electronics to be used as control and measurement systems in conjunction with spin ensembles located in magnetic fields of up to 1 Tesla.

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