Spatial Entanglement Sudden Death in Spin Chains at All Temperatures

Samuel O. Scalet (Feb 25 2026).

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.

Arxiv: https://arxiv.org/abs/2602.20694