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This research identifies connectivity-induced surface loss as a fundamental bottleneck scaling superconducting quantum processors, revealing that denser coupling networks actively degrade coherence times despite improved material quality. By quantifying how added couplers increase dielectric loss through field redistribution and hybridization, the study provides critical architectural constraints for designing next-generation qubit lattices beyond isolated performance metrics.

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Chinese Academy of Sciences Maps Surface-Loss in Qubit Lattices

Quantum ZeitgeistJuly 21, 20265 min read

Xu-Yang Gu, Gui-Han Liang, Ming-Chuan Wang, Yongxi Xiao, Cheng-Lin Deng, Zheng-He Liu, Tian-Ming Li, Kai Xu, Zhongcheng Xiang, and Heng Fan, from the Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, investigated connectivity-induced surface-loss penalty in superconducting qubit-coupler lattices. The research focuses on understanding penalties related to surface-loss in these lattices.

Researchers from the Beijing National Laboratory for Condensed Matter Physics and the Beijing Academy of Quantum Information Sciences report on their investigation of a surprising source of performance loss in superconducting qubit lattices: the very connections designed to enhance qubit communication. The work demonstrates that increasing the connectivity of these lattices, essential for building more complex quantum processors, leads to larger surface loss. Controlled simulations reveal that connecting a qubit to two and four couplers increases surface loss by factors of 1.3 and 1.8,…

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