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Aluminum Grain Size Linked To Improved Qubit Coherence Times
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Aluminum Grain Size Linked To Improved Qubit Coherence Times
Material losses in superconducting circuits fundamentally limit qubit coherence times and resonator quality factors, and this work links the aluminum film grain size to non-TLS losses and the dielectric trimming profile and roughness to TLS loss. To reduce metal-related losses, the aluminum microstructure is engineered by heating during deposition, increasing grain size and reducing grain boundary density.
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