Determination of ground-state properties in quantum spin systems by single-qubit unitary operations and entanglement excitation energies (Articolo in rivista)

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  • Determination of ground-state properties in quantum spin systems by single-qubit unitary operations and entanglement excitation energies (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevA.77.012319 (literal)
Alternative label
  • Giampaolo, SM; Illuminati, F; Verrucchi, P; De Siena, S (2008)
    Determination of ground-state properties in quantum spin systems by single-qubit unitary operations and entanglement excitation energies
    in Physical review. A
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giampaolo, SM; Illuminati, F; Verrucchi, P; De Siena, S (literal)
Pagina inizio
  • 012319 (literal)
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  • http://pra.aps.org/abstract/PRA/v77/i1/e012319 (literal)
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  • 77 (literal)
Rivista
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  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Giampaolo, S. M.; Illuminati, F.; De Siena, S.] Univ Salerno, Dipartimento Matemat & Informat, I-84084 Fisciano, Italy; [Giampaolo, S. M.; Illuminati, F.; De Siena, S.] CNR, INFM Coherentia, I-80125 Naples, Italy; [Giampaolo, S. M.; Illuminati, F.; De Siena, S.] CNISM, Unit Salerno, Salerno, Italy; [Giampaolo, S. M.; Illuminati, F.; De Siena, S.] Grp Coll Salerno, Ist Nazl Fis Nucl Sezione Napoli, Baronissi, Italy; [Illuminati, F.] ISI, Fdn Sci Interchange, I-00173 Rome, Italy; [Verrucchi, P.] Univ Florence, Dipartimento Fis, I-50019 Sesto Fiorentino, Italy; [Verrucchi, P.] CNR, INFM, SMC, I-50019 Sesto Fiorentino, Italy (literal)
Titolo
  • Determination of ground-state properties in quantum spin systems by single-qubit unitary operations and entanglement excitation energies (literal)
Abstract
  • We introduce a method for analyzing ground-state properties of quantum many-body systems, based on the characterization of separability and entanglement by single subsystem unitary operations. We apply the method to the study of the ground-state structure of several interacting spin-1/2 models, described by Hamiltonians with different degrees of symmetry. We show that the approach based on single-qubit unitary operations allows us to introduce 'entanglement excitation energies,' a set of observables that can characterize ground-state properties, including the quantification of single-site entanglement and the determination of quantum critical points. The formalism allows us to identify the existence and location of factorization points, and a purely quantum 'transition of entanglement' that occurs at the approach of factorization. This kind of quantum transition is characterized by a diverging ratio of excitation energies associated with single-qubit unitary operations. (literal)
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