dc.date.accessioned 2021-06-10T15:02:13Z dc.date.available 2021-06-10T15:02:13Z dc.identifier.uri https://digital.cic.gba.gob.ar/handle/11746/10969 dc.title Fermionic entanglement in the Lipkin model en dc.type Artículo es dcterms.abstract We examine the fermionic entanglement in the ground state of the fermionic Lipkin model and its relation with bipartite entanglement. It is first shown that the one-body entanglement entropy, which quantifies the minimum distance to a fermionic Gaussian state, behaves similarly to the mean-field order parameter and is essentially proportional to the total bipartite entanglement between the upper and lower modes, a quantity meaningful only in the fermionic realization of the model. We also analyze the entanglement of the reduced state of four single-particle modes (two up-down pairs), showing that its fermionic concurrence is strongly peaked at the phase transition and behaves differently from the corresponding up-down entanglement. We finally show that the first measures and the up-down reduced entanglement can be correctly described through a basic mean-field approach supplemented with symmetry restoration, whereas the concurrence requires at least the inclusion of random-phase-approximation–type correlations for a proper prediction. Fermionic separability is also discussed. en dcterms.issued 2019-12-03 dcterms.language Inglés es dcterms.license Attribution-NonCommercial-NoDerivatives 4.0 Internacional es dcterms.subject Quantum entanglement en dcterms.subject Fermion systems en cic.version info:eu-repo/semantics/submittedVersion es dcterms.creator.author Di Tullio, Marco es dcterms.creator.author Rossignoli, Raúl Dante es dcterms.creator.author Cerezo, M. es dcterms.creator.author Gigena, N. es cic.lugarDesarrollo Universidad Nacional de La Plata es dcterms.subject.materia Ciencias Físicas es dcterms.identifier.url Recurso completo es dcterms.isPartOf.issue vol. 100 es dcterms.isPartOf.series Physical Review A es cic.isPeerReviewed true es cic.isFulltext true es
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