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    Beating Hermitian Speed Limits for Entanglement Generation via Exceptional Points in a Trapped-Ion System

    W. F. Yuan1,2,*, B. B. Liu3,*, N. Li1,2,*, G. Y. Ding6,1, W. Q. Ding1,2, H. J. Du1,2, J. C. Li6,1, G. Chen3, H. Jing4 et al.

    F. Zhou1,7,†, Shi-Lei Su3,5,9,‡, and M. Feng1,7,8,10,§

    • *These authors contributed equally to this work.
    • †Contact author: zhoufei@wipm.ac.cn
    • ‡Contact author: slsu@zzu.edu.cn
    • §Contact author: mangfeng@wipm.ac.cn

    Phys. Rev. Lett. 136, 210201 – Published 28 May, 2026

    DOI: https://doi.org/10.1103/g8v5-rbq7

    Abstract

    Entanglement generation is a cornerstone of quantum information science, yet its speed in Hermitian systems is fundamentally constrained by the coupling strength, a restriction known as the quantum speed limit. Here we demonstrate that this bound can be beaten by exploiting the unique topology of non-Hermitian systems near exceptional points (EPs). Using a pair of trapped ions, we engineer a parity-time symmetric Hamiltonian where the coalescence of eigenstates near the EP distorts the Hilbert space geometry, providing a shortcut for quantum state evolution. We observe that, as the system approaches the EP, the time required to generate a maximally entangled state is markedly reduced with respect to the limits imposed by the equivalent Hermitian interaction. We further uncover a fundamental physical trade-off whereby the acceleration of entanglement is intrinsically coupled to a reduction in the success probability, revealing the information cost of non-Hermitian speedup. Our results suggest that tailored dissipation, rather than being a source of decoherence, can serve as a powerful resource for accelerating quantum dynamics, offering a new paradigm for designing high-speed quantum gates and sensors in hardware-constrained platforms.

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