Divergence of the entanglement range in low-dimensional quantum systems (Articolo in rivista)

Type
Label
  • Divergence of the entanglement range in low-dimensional quantum systems (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevA.74.022322 (literal)
Alternative label
  • Amico, L; Baroni, F; Fubini, A; Patane, D; Tognetti, V; Verrucchi, P (2006)
    Divergence of the entanglement range in low-dimensional quantum systems
    in Physical review. A
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Amico, L; Baroni, F; Fubini, A; Patane, D; Tognetti, V; Verrucchi, P (literal)
Pagina inizio
  • 022322 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://link.aps.org/doi/10.1103/PhysRevA.74.022322 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 74 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • INFM, MATIS, I-95125 Catania, Italy; Univ Catania, DMFCI, I-95125 Catania, Italy; Univ Florence, Dipartimento Fis, I-50019 Sesto Fiorentino, Italy; Ist Nazl Fis Nucl, Sez Firenze, I-50019 Sesto Fiorentino, Italy; CNR, Sez Firenze, Inst Nazl Fis Mat, Ctr Ric & Sviluppo SMC, I-50019 Sesto Fiorentino, Italy (literal)
Titolo
  • Divergence of the entanglement range in low-dimensional quantum systems (literal)
Abstract
  • We study the pairwise entanglement close to separable ground states of a class of one-dimensional quantum spin models. At T=0 we find that such ground states separate regions, in the space of the Hamiltonian parameters, which are characterized by qualitatively different types of entanglement, namely parallel and antiparallel entanglement; we further demonstrate that the range of the concurrence diverges while approaching separable ground states, therefore evidencing that such states, with uncorrelated fluctuations, are reached by a long range reshuffling of the entanglement. We generalize our results to the analysis of quantum phase transitions occurring in bosonic and fermionic systems. Finally, the effects of finite temperature are considered: At T > 0 we evidence the existence of a region where no pairwise entanglement survives, so that entanglement, if present, is genuinely multipartite. (literal)
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