Entanglement entropy: non-Gaussian states and strong coupling

A bstract In this work we provide a method to study the entanglement entropy for non-Gaussian states that minimize energy functional of interacting quantum field theories at arbitrary coupling. To end, build class variational trial wavefunctionals with help exact nonlinear canonical transformations. The calculability bonanza shown by these ansatze allows us compute using prescription ground state free theories. theories, is determined two-point correlation functions. For case, show correlators can be replaced their nonperturbatively corrected counterparts. Upon giving some general formulae models calculate half space and compact regions ? 4 scalar theory in 2D. Finally, analyze rôle played higher order our results strong subadditivity satisfied.