Experimental analysis of decoherence in continuous-variable bipartite systems (Articolo in rivista)

Type
Label
  • Experimental analysis of decoherence in continuous-variable bipartite systems (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevA.86.042308 (literal)
Alternative label
  • D. Buono 1, G. Nocerino 1, A. Porzio 2,3, and S. Solimeno 3 (2012)
    Experimental analysis of decoherence in continuous-variable bipartite systems
    in Physical review. A
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • D. Buono 1, G. Nocerino 1, A. Porzio 2,3, and S. Solimeno 3 (literal)
Pagina inizio
  • 042308-1 (literal)
Pagina fine
  • 042308-12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://link.aps.org/doi/10.1103/PhysRevA.86.042308 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 86 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 4 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1Facoltà di Scienze Matematiche, Fisiche e Naturali, Università di Salerno, via Ponte don Melillo, I-84084 Fisciano (SA), Italy 2CNR-SPIN, Napoli, Italy 3Dipartimento di Scienze Fisiche, Università \"Federico II\", Complesso Universitario Monte Sant'Angelo, I-80126 Napoli, Italy (literal)
Titolo
  • Experimental analysis of decoherence in continuous-variable bipartite systems (literal)
Abstract
  • Quantum properties are soon subject to decoherence once the quantum system interacts with the classical environment. In this paper we experimentally test how propagation losses, in a Gaussian channel, affect the bipartite Gaussian entangled state generated by a subthreshold type-II optical parametric oscillator. Experimental results are discussed in terms of different quantum markers, as teleportation fidelity, quantum discord, and mutual information, and continuous-variable (CV) entanglement criteria. To analyze state properties we have retrieved the composite system covariance matrix by a single homodyne detector. We experimentally found that, even in the presence of a strong decoherence, the generated state never disentangles and keeps breaking the quantum limit for the discord. This result proves that the class of CV entangled states discussed in this paper would allow, in principle, to realize quantum teleportation over an infinitely long Gaussian channel. (literal)
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