In (e,2e) scattering, the entanglement of the outgoing electron pair can be expressed through measured spin-resolved triple differential cross sections, and even unpolarized initial electrons can produce entangled pairs when singlet scattering dominates.
Thus, if the bipartite quantum state is pure, mixedness of the reduced density matrix expressed in terms of the entropy measures is a valid entanglement witness
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Entanglement balance of quantum $(e,2e)$ scattering processes
In (e,2e) scattering, the entanglement of the outgoing electron pair can be expressed through measured spin-resolved triple differential cross sections, and even unpolarized initial electrons can produce entangled pairs when singlet scattering dominates.