Two-dimensional correlation propagation dynamics with a cluster discrete phase-space method

• URL: http://arxiv.org/abs/2404.18594v2
• Date: Wed, 8 May 2024 10:16:14 GMT
• Title: Two-dimensional correlation propagation dynamics with a cluster discrete phase-space method
• Authors: Kazuma Nagao, Seiji Yunoki,
• Abstract summary: Nonequilibrium dynamics of highly-controlled quantum systems is a challenging issue in statistical physics. We develop a discrete phase-space approach for general SU($N$) spin systems that capture non-trivial quantum correlations inside each cluster. We demonstrate that the cluster discrete truncated Wigner approximation can reproduce key results in a recent experiment on the correlation propagation dynamics in a two dimensional Bose-Hubbard system.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Nonequilibrium dynamics of highly-controlled quantum systems is a challenging issue in statistical physics and quantum many-body physics, relevant to recent experimental developments of analog and digital quantum simulations. In this work, we develop a discrete phase-space approach for general SU($N$) spin systems that utilizes cluster mean field equations, which capture non-trivial quantum correlations inside each cluster, beyond the capability of the standard discrete truncated Wigner approximation for individual classical spins. Our formalism, based on a cluster phase-point operator, makes it possible to realize scalable numerical samplings of cluster phase-space variables, where the total number of noise variables for a direct product state is independent of the choice of the separation into finite regions of clusters. We numerically demonstrate that the cluster discrete truncated Wigner approximation (C-dTWA) method can reproduce key results in a recent experiment on the correlation propagation dynamics in a two dimensional Bose-Hubbard system. We also compare the results of C-dTWA for clusters of $2\times 2$ sites with those of a two-dimensional tensor network method and discuss that both approaches agree very well in a short time region, where the energy is well conserved in the tensor network simulations. Since we formulate the C-dTWA method in a general form, it can be potentially applied to various dynamical problems in isolated and open quantum systems even in higher dimensions.

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