Local nonfreeness in Hubbard models equals mutual information of natural spin orbitals and is fully classical under number conservation, linking to nonlocal entanglement.
Horodecki, Separability criterion and inseparable mixed states with positive partial transposition, Physics Letters A 232, 333 (1997)
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Local classical correlations between physical electrons in Hubbard systems
Local nonfreeness in Hubbard models equals mutual information of natural spin orbitals and is fully classical under number conservation, linking to nonlocal entanglement.