2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/91063A complete analysis on the generation of spin entanglement from NRQED is presented. The results of entanglement are obtained with relativistic correction to the leading order of (v/c)^2. It is shown that to this order the degree of entanglement of a singlet state does not change under time evolution whereas the triplet state can change.8 pages, 1 figure, to appear in Phys. Rev. AQuantum Physicstext