Observation of Non-Gaussian Magnon Dynamics in a Two-Dimensional Long-Range XY Model

• URL: http://arxiv.org/abs/2606.13499v1
• Date: Thu, 11 Jun 2026 15:49:44 GMT
• Title: Observation of Non-Gaussian Magnon Dynamics in a Two-Dimensional Long-Range XY Model
• Abstract summary: Non-Gaussian evolution of high-order spin correlations characterizes important properties of quantum many-body systems.<n>Our work provides a verifiable path from classically simulatable dynamics to regimes where quantum advantage may emerge.
• Score: 0.5365203575002531
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-Gaussian evolution of high-order spin correlations characterizes important properties of quantum many-body systems. In practice, decoherence, statistical fluctuation and miscalibration of experimental parameters all hinder the witness of non-Gaussian dynamics. Here we demonstrate the crossover between Gaussian and non-Gaussian dynamics on a two-dimensional XY model with long-range and spatially structured interaction using a trapped ion quantum simulator. We prepare different initial densities of magnon excitations and verify the dynamics of single-spin observables for the engineered Hamiltonian. Then we compare the high-order spin correlations with the mean-field solution and the Holstein-Primakoff approximation, and demonstrate the non-Gaussian behavior in a way independent of the calibration errors. Our work provides a verifiable path from classically simulatable dynamics to regimes where quantum advantage may emerge.

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