Flip-chip quantum processor with 21 superconducting qubits arranged in a 1D chain with multiple legs.

From the article:

Direct Implementation of High-Fidelity Three-Qubit Gates for Superconducting Processor with Tunable Couplers
Hao-Tian Liu, Bing-Jie Chen, Jia-Chi Zhang, Yong-Xi Xiao, Tian-Ming Li, Kaixuan Huang, Ziting Wang, Hao Li, Kui Zhao, Yueshan Xu, Cheng-Lin Deng, Gui-Han Liang, Zheng-He Liu, Si-Yun Zhou, Cai-Ping Fang, Xiaohui Song, Zhongcheng Xiang, Dongning Zheng, Yun-Hao Shi, Kai Xu, and Heng Fan
Phys. Rev. Lett. 135, 050602 (2025)

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