A fast-sealing microwave cavity compatible with measurements of superconducting qubits and resonators*

3D microwave cavities provide a versatile platform to control and readout superconducting devices for quantum computing. In this work we develop an approach to measure the decoherence of superconducting resonators and qubits in a 3D cavity that can be sealed and evacuated on the order of a few minutes. This technique has the potential to significantly reduce microwave loss by limiting the growth of metal oxides to negligible levels, compared to the common packaging approaches used in the field that expose the device to air for uncontrolled periods of time.

 

The microwave properties of the hermetically sealed cavity were modelled using electromagnetic simulation software and validated through reflection measurements. Here we will discuss our preliminary work on using this cavity for studies of the coherence of niobium based superconducting devices.