Spatial Entanglement Sudden Death in Spin Chains at All Temperatures
arXiv:2602.20694
Abstract
We prove a finite entanglement length for the Gibbs state of any local Hamiltonian on a spin chain at any finite temperature: After removing an interval of size at least equal to the entanglement length, the remaining left and right half-chains are in a separable state.
19 pages, 2 figures