It says everywhere that particle decay is not the only thing that creates entangled particles. "Quantum entanglement is a physical phenomenon that occurs when pairs or groups of particles are generated or interact in ways such that the quantum state of each particle cannot be described independently — instead, a quantum state may be given for the system as a whole." It says subatomic particles can get entangled after they interact in special ways. For example, all the electrons that orbit the same nucleus are entangled. Can you name other such interactions?