Bounded entanglement entropy in the quantum Ising model
arXiv:1906.11954 · doi:10.1007/s10955-019-02432-y
Abstract
A rigorous proof is presented of the boundedness of the entanglement entropy of a block of spins for the ground state of the one-dimensional quantum Ising model with sufficiently strong transverse field. This is proved by a refinement of the arguments in the earlier work by the same authors (J. Statist. Phys. 131 (2008) 305-339). The proof is geometrical, and utilises a transformation to a model of classical probability called the continuum random-cluster model. Our method of proof is fairly robust, and applies also to certain disordered systems.
Continuation of arXiv:0704.2981. V3: accepted version