Correlation transfer in large-spin chains

Abstract

It is shown that transient spin-spin correlations in one-dimensional spin S>>1 chain can be enhanced for initially factorized and individually squeezed spin states. Such correlation transfer form "internal" to "external" degrees of freedom can be well described by using a semiclassical phase-space approach.Comment: 5 pages, 5 fig

Quasiprobability currents on the sphere

“…This semiclassical evolution allows one to predict the shorttime behavior [57,58]. The positive and negative parts of…”

“…This semiclassical evolution allows one to predict the shorttime behavior [57,58]. The positive and negative parts of W (s) ρ (Ω,t = 0) are deformed according to (2.13), so that their volumes are preserved during the validity of the TWA.…”

GeneralizedSU(2) covariant Wigner functions and some of their applications

“…This Hamiltonian can be seen to exhibit a second order phase transition for gε χ = . When the initial state is a spin coherent state 2, 0 even in this unstable regime [112]. The deviation of the semi-classical evolution from the exact evolution of the fourth order moment m 4 of equation (2.39) is quite different above and below the phase transition: below the transition, when g ⩽ ε χ, the semi-classical approximation hold to S × S S , the evolution along classical trajectories leads to inter-dependence of phase variables in the individual sub-manifolds, which results in a strong correlation between interacting subsystems.…”

“…Finally, we add the TWA also describes the long-time dynamics of some other properties of multi-partite systems, such as the negativity [71], which characterizes spin-spin correlations [112].…”