Analysis of continuous and discrete Wigner approximations for spin dynamics
arXiv:1807.02171 · doi:10.1103/PhysRevA.99.043627
Abstract
We compare the continuous and discrete truncated Wigner approximations of various spin models' dynamics to exact analytical and numerical solutions. We account for all components of spin-spin correlations on equal footing, facilitated by a recently introduced geometric correlation matrix visualization technique [R. Mukherjee {\em et al.}, Phys. Rev. A {\bf 97}, 043606 (2018)]. We find that at modestly short times, the dominant error in both approximations is to substantially suppress spin correlations along one direction.
arXiv comment19 pages, 19 figures; The first two authors contributed equally
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