Local nonfreeness in Hubbard models equals mutual information of natural spin orbitals and is fully classical under number conservation, linking to nonlocal entanglement.
Laflorencie, Quantum entanglement in condensed matter systems, Physics Reports 646, 1–59 (2016)
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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.