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Enabling applications for solid state quantum technology will requiresystematically reducing noise, particularly dissipation, in these systems. Yet,when multiple decay channels are present in a system with similar weight,resolution to distinguish relatively small changes is necessary to inferimprovements to noise levels. For superconducting qubits, uncontrolledvariation of nominal performance makes obtaining such resolution challenging.Here, we approach this problem by investigating specific combinations ofpreviously reported fabrication techniques on the quality of 242 thin filmsuperconducting resonators and qubits. Our results quantify the influence ofelementary processes on dissipation at key interfaces. We report that anend-to-end optimization of the manufacturing process that integrates multiplesmall improvements together can produce an average${\overline{T}_{1}=76\pm13~\mu}$s across 24 qubits with the best qubits having${T_1\geq110~\mu}$s. Moreover, our analysis places bounds on energy decay ratesfor three fabrication-related loss channels present in state-of-the-artsuperconducting qubits. Understanding dissipation through such systematicanalysis may pave the way for lower noise solid state quantum computers.

Manufacturing low dissipation superconducting quantum processors