Ground states of fermionic Hamiltonians limited to M-body interactions cannot achieve maximal M-body entanglement.
Large eigen- value of the cumulant part of the two-electron reduced density matrix as a measure of off-diagonal long-range order
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Many-Body Entanglement Properties of Finite Interacting Fermionic Hamiltonians
Ground states of fermionic Hamiltonians limited to M-body interactions cannot achieve maximal M-body entanglement.