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PHYSICS LETTERS A
Volume 331, Issue 1-2, Pages 39-44Publisher
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DOI: 10.1016/j.physleta.2004.08.037
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We show that with respect to any bipartite division of modes, pure fermion Gaussian states display the same type of structure in its entanglement of modes as that of the BCS wave function, namely, that of a tensor product of entangled two-mode squeezed fermion states. We show that this structure applies to a wider class of isotropic mixed fermion states, for which we derive necessary and sufficient conditions for mode entanglement. (C) 2004 Elsevier B.V. All rights reserved.
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