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    Geometric protected quantum bus in a hybrid superconducting-spin architecture

    Xing-Yu Zhu1,2, Zhu-Cheng Yue1, Guang-Can Guo1,3, Tao Tu1,3,*, and Chuan-Feng Li1,3,†

    • *Contact author: tutao@ustc.edu.cn
    • †Contact author: cfli@ustc.edu.cn

    Phys. Rev. Applied 25, 044010 – Published 3 April, 2026

    DOI: https://doi.org/10.1103/dftf-g4kc

    Abstract

    Hybrid quantum systems integrating spin qubits and superconducting qubits have emerged as promising candidates for scalable quantum information processing. In hybrid architectures, the development of high-fidelity quantum buses is a crucial but challenging element. Here we design a quantum bus that utilizes engineered virtual photons to couple spin and superconducting modules. We tailor the driving pulse to accelerate the evolution of the hybrid system in a noncyclic geometric phase way. We demonstrate the enhanced functionality of the quantum bus in three ways. First, we propose a scheme for realizing universal gate operation between different modules in a short time of 40 ns with 99.05% fidelity, exceeding the fault-tolerance threshold. Second, we theoretically demonstrate the preparation of remote entanglement between different modules with a fidelity of 99.21%, a valuable resource for hybrid architectures. Finally, we show the robustness of this approach to control parameter imperfections compared to usual dynamical pulses. These results provide a toolbox for fast, high-fidelity, and robust quantum information processing on hybrid platforms.

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