Local nonfreeness in Hubbard models equals mutual information of natural spin orbitals and is fully classical under number conservation, linking to nonlocal entanglement.
Alternatively one can define free states as those states for which the Wick theorem holds for computing any N-body expectation value
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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.