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    Chiral transfer and entanglement generation of even-parity Bell states with engineered two-photon loss

    Lin Xiao1, Jian Li1,2,3, Mu Zhou1,2, Bin Wei4,*, Qing-Xu Li1,2,†, and Jia-Ji Zhu1,2,3,‡

    • *Contact author: weibin@cqu.edu.cn
    • †Contact author: liqx@cqupt.edu.cn
    • ‡Contact author: zhujj@cqupt.edu.cn

    Phys. Rev. A 114, 042417 – Published 13 October, 2026

    DOI: https://doi.org/10.1103/lwy7-fs72

    Abstract

    We investigate chiral transfer and dissipative generation of even-parity Bell states in a two-qubit system with coherent two-photon driving and engineered two-photon loss. We find that adiabatic encirclement of a second-order exceptional point induces direction-dependent transfer between the Bell states |Φ+〉 and |Φ−〉, governed by a time-integrated low-loss branch-selection mechanism. We develop a hybrid-Liouvillian description with a control parameter q that interpolates between conditional no-jump dynamics and unconditional Lindblad evolution and use it to assess how exceptional-point-induced chirality survives in the presence of quantum jumps. When the same parameter loop is initialized in the separable state |00〉, it directly generates strong even-parity entanglement. Together, these results extend dissipative Bell-state control beyond the single-excitation manifold. They further demonstrate that exceptional-point-based protocols can unify chiral state transfer and entanglement generation within a single engineered two-photon platform.

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