NSLS-II Friday Lunchtime Seminar
"Correlating microscopic materials properties with superconducting qubit performance"
Presented by Anjali Premkumar, Department of Electrical Engineering, Princeton University
Friday, June 5, 2020, 12:00 pm — via Zoom - contact: firstname.lastname@example.org
In recent years, evidence has emerged that superconducting qubit performance is limited by imperfections in constituent materials. To characterize the microscopic character of these imperfections, we performed measurements of qubit lifetimes in parallel with structural and electron microscopy of the niobium films used in qubit fabrication. Correlations were found between qubit relaxation times and several materials properties, including grain size, oxide composition on the surface and within grain boundaries, and residual resistance. These findings represent a novel approach to understanding sources of qubit decoherence, utilizing techniques such as hard x-ray photoelectron spectroscopy and transmission electron microscopy.
Hosted by: Ignace Jarrige
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