Ultimate classical communication rates of quantum optical channels (Articolo in rivista)

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Label
  • Ultimate classical communication rates of quantum optical channels (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/nphoton.2014.216 (literal)
Alternative label
  • Giovannetti V.[ 1,2 ]; GarciA-PatroN R.[ 3,4 ]; Cerf N.J.[ 3 ]; Holevo A.S.[ 5,6 ] (2014)
    Ultimate classical communication rates of quantum optical channels
    in Nature photonics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giovannetti V.[ 1,2 ]; GarciA-PatroN R.[ 3,4 ]; Cerf N.J.[ 3 ]; Holevo A.S.[ 5,6 ] (literal)
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  • 796 (literal)
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  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84908042553&partnerID=q2rCbXpz (literal)
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  • 8 (literal)
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  • 800 (literal)
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  • 10 (literal)
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  • Scopu (literal)
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  • [ 1 ] Scuola Normale Super Pisa, NEST, I-56127 Pisa, Italy [ 2 ] Ist Nanosci CNR, I-56127 Pisa, Italy [ 3 ] Univ Libre Bruxelles, Ecole Polytech Bruxelles, QuIC, B-1050 Brussels, Belgium [ 4 ] Max Planck Inst Quantum Opt, D-85748 Garching, Germany [ 5 ] RAS, Steklov Math Inst, Moscow 119991, Russia [ 6 ] Natl Res Univ, HSE, Moscow 101000, Russia (literal)
Titolo
  • Ultimate classical communication rates of quantum optical channels (literal)
Abstract
  • Optical channels, such as fibres or free-space links, are ubiquitous in today's telecommunication networks. They rely on the electromagnetic field associated with photons to carry information from one point to another in space. A complete physical model of these channels must necessarily take quantum effects into account to determine their ultimate performances. Single-mode, phase-insensitive bosonic Gaussian channels have been extensively studied over past decades, given their importance for practical applications. In spite of this, a long-standing unsolved conjecture on the optimality of Gaussian encodings has prevented finding their classical communication capacity. Here, this conjecture is solved by proving that the vacuum state achieves the minimum output entropy of these channels. This establishes the ultimate achievable bit rate under an energy constraint, as well as the long awaited proof that the single-letter classical capacity of these channels is additive. (literal)
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