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    Circumventing the no-go theorem for superradiant phase transition in a three-level quantum Rabi dimer model

    Wen-Bo Li, Yan Zhang*, Jianxun Hu, Chen-Zhong Dong, and Jun Jiang†

    • Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

    • *Contact author: zhangyan@nwnu.edu.cn
    • †Contact author: phyjiang@yeah.net

    Phys. Rev. A 113, 043725 – Published 14 April, 2026

    DOI: https://doi.org/10.1103/ks3s-64zs

    Abstract

    We examine quantum phase transitions in a two-cavity system, where each cavity is described by a three-level quantum Rabi model, and the two cavities are coupled via photon hopping. Combining analytical and numerical methods, we reveal that a reversed superradiant phase transition emerges even under the strong A2 term. The photon-hopping interaction circumvents the no-go theorem imposed by the A2 term and allows for significant modulation of the phase transitions and critical phenomena. We determine the phase diagrams and scaling functions, and obtain the critical exponents that characterize the universality class. This work elucidates the competition between the intercavity photon hopping and the A2 term, providing a pathway to achieve the superradiant phase transition of the three-level quantum Rabi model in cavity quantum electrodynamics and other relevant platforms.

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