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    Stabilizer entropy and entanglement complexity in the Sachdev-Ye-Kitaev model

    Barbara Jasser1,2,*, Jovan Odavić2,3,†, and Alioscia Hamma1,2,3,‡

    • *Contact author: b.jasser@ssmeridionale.it
    • †Contact author: jovan.odavic@unina.it
    • ‡Contact author: alioscia.hamma@unina.it

    Phys. Rev. B 112, 174204 – Published 14 November, 2025

    DOI: https://doi.org/10.1103/rz86-47h3

    Abstract

    The Sachdev-Ye-Kitaev (SYK) model is of paramount importance for the understanding of both strange metals and a microscopic theory of two-dimensional gravity. We study the interplay between stabilizer Rényi entropy and entanglement entropy in both the ground state and highly excited states of the SYK−4+SYK−2 model, interpolating the highly chaotic four-body interactions model with the integrable two-body interactions one. The interplay between these quantities is also assessed through universal statistics of the entanglement spectrum and its antiflatness. We find that SYK-4 is indeed characterized by a complex pattern of both entanglement and nonstabilizer resources, while SYK-2 is nonuniversal and not complex. We discuss the fragility and robustness of these features depending on the interpolation parameter.

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