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By "classical method" we are referring to all methods which employ calculations based on separable states. The Hartree-Fock method along with the concept of the Fermi surface are both examples of this type of reasoning. (The Fermi sea is expressible as a single Slater determinant so it can be considered to exhibit no quantum correlations [8-11]).
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85015741199
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It should he noted that this interpretation is subject to the condition that Y is additive.
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85015727778
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note
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It is worth noting that the concurrence (and therefore the entanglement of formation) measures only two-party entanglement. It does not measure the many-party entanglement in states like the GHZ state (1/√2)(|↑↑↑〉+|↓↓↓〉), where the concurrence is zero for any pair of spins.
-
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-
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62
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85015721493
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note
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2) such a measure is given by the three-tangle (see Ref. [54] for further details).
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63
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85015756060
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Wootters, W.K.1
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