Universal spin-squeezing dynamical phase transitions across lattice geometries, dimensions, and microscopic couplings
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 bilayers as well as ladders, and a symmetry-preserving rescaling 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 with critical exponents consistent within error, providing strong evidence for a genuine nonequilibrium universality class. The Bogoliubov theory recovers the previously identified scaling in the long-range interacting regime , and yields an analytical scaling for the critical aspect ratio with system size for , with the power-law exponent in dimension . This uncovers a previously unrecognized sublinear regime for short-range interactions. By tuning , 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.