Authors:

Zach Miles

Date Created:

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Professor:

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About Paper:

Superconducting quantum circuits are one of the leading realizations of qubit. Among these qubits there exists a special type known as a topological insulator (TI) transmon qubit. This lab is working to craft an effective TI transmon with a Copper 3D resonant cavity. We need to understand where the microwave losses come from in this recently made prototype. An Aluminum 3D resonant cavity was used, which is superconducting at low temperatures, offering a higher quality (Q) factor of the resonator than Copper. In this Aluminum 3D qubit architecture, we used the scientific method to find out which fabrication step or material causes the most loss. In a cryogenic environment of ~10 mK, the Q factor and full width at half maximum (FWHM) were measured of each variation of the 3D cavity. The Q factor and FWHM were compared in each configuration experiment. We have identified sources of microwave losses in these specific qubit materials used. The materials used may not be perfect for qubits and other materials should be explored. Otherwise, efforts can be made to reduce the losses in these materials in any way possible. Another prospect is using a superconducting cavity to study the lossiness of materials. The results from this experiment are meant to provide insight into the fabrication of the 3D TI transmon.

Source:

Purdue University / 2023

Topics:

No topics listed

Co-authors:

Zach Miles