Long-distance entanglement and quantum teleportation in XX spin chains (Articolo in rivista)

Type
Label
  • Long-distance entanglement and quantum teleportation in XX spin chains (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Venuti, LC; Giampaolo, SM; Illuminati, F; Zanardi, P (2007)
    Long-distance entanglement and quantum teleportation in XX spin chains
    in Physical review. A
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Venuti, LC; Giampaolo, SM; Illuminati, F; Zanardi, P (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 76 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • ISI, Fdn Sci Interchange, I-10133 Turin, Italy; Univ Salerno, Dipartimento Matemat & Informat, I-84084 Fisciano, SA, Italy; INFM, CNR, Naples, Italy; CNISM Unit Salerno, Baronissi, SA, Italy; Ist Nazl Fis Nucl, Sez Napoli, Grp Collegato Salerno, Baronissi, SA, Italy; Univ So Calif, Dept Phys & Astron, Los Angeles, CA 90089 USA (literal)
Titolo
  • Long-distance entanglement and quantum teleportation in XX spin chains (literal)
Abstract
  • Isotropic XX models of one-dimensional spin-1/2 chains are investigated with the aim to elucidate the formal structure and the physical properties that allow these systems to act as channels for long-distance, high-fidelity quantum teleportation. We introduce two types of models: (i) open, dimerized XX chains, and (ii) open XX chains with small end bonds. For both models we obtain the exact expressions for the end-to-end correlations and the scaling of the energy gap with the length of the chain. We determine the end-to-end concurrence and show that model (i) supports true long-distance entanglement at zero temperature, while model (ii) supports 'quasi-long-distance' entanglement that slowly falls off with the size of the chain. Due to the different scalings of the gaps, respectively exponential for model (i) and algebraic in model (ii), we demonstrate that the latter allows for efficient qubit teleportation with high fidelity in sufficiently long chains even at moderately low temperatures. (literal)
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