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    Universal spin-squeezing dynamical phase transitions across lattice geometries, dimensions, and microscopic couplings

    Arman Duha and Thomas Bilitewski*

    • *Contact author: thomas.bilitewski@okstate.edu

    Phys. Rev. A 114, 032458 – Published 28 September, 2026

    DOI: https://doi.org/10.1103/py4q-klzp

    Abstract

    Recent work has identified a dynamical squeezing phase transition in power-law interacting bilayer XXZ spin models, separating a fully collective phase with Heisenberg-limited squeezing from a partially collective phase with universal critical scaling. Here we test and establish the universality of this transition along two qualitatively different microscopic axes: lattice geometry, by studying square, triangular, and honeycomb two-dimensional (2D) bilayers as well as 1D ladders, and a symmetry-preserving rescaling λ of the interlayer couplings relative to the intralayer ones. Combining a Bogoliubov instability analysis with discrete truncated Wigner simulations, we find that the transition persists across all four lattice geometries and over a wide range of λ with critical exponents consistent within error, providing strong evidence for a genuine nonequilibrium universality class. The Bogoliubov theory recovers the previously identified scaling aZ*∝L in the long-range interacting regime α<d+2, and yields an analytical scaling aZ*∝L2/(α−d) for the critical aspect ratio with system size for α>d+2, with α the power-law exponent in dimension d. This uncovers a previously unrecognized sublinear regime for short-range interactions. By tuning λ, we vary the interlayer coupling strength at fixed layer spacing, demonstrating that the dynamical transition can be driven purely through interaction engineering without modifying the underlying geometry. These findings provide a versatile route toward controlling entanglement generation in Rydberg-array, polar molecule, and trapped-ion platforms with applications in quantum sensing and simulation.

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