The primary sources of errors are control imperfections and decoherence. While control errors can be effectively mitigated through engineering advances, reducing decoherence is more complex, requiring insights at the intersection of physics and materials science. Currently, no definitive solution has been identified, and decoherence remains the most significant obstacle to achieving higher fidelities and realizing practical quantum information processing.
This Special Topic collection of articles is dedicated to covering recent advances in material research and fabrication for superconducting quantum devices. The topics of interest include but are not limited to interface engineering to reduce losses, such as the engineering of pristine interfaces, growth of low-loss oxides, and introduction of capping layers to prevent oxidation, two-level fluctuations in their role in dissipation and exploration of new superconductor materials and substrates in application to quantum devices. The special topic also welcomes new insights into the fabrication of highly coherent superconducting quantum devices and novel techniques to characterize losses and their mechanisms.
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