Electromagnetic channel capacity for practical purposes (Articolo in rivista)

Type
Label
  • Electromagnetic channel capacity for practical purposes (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/nphoton.2013.193 (literal)
Alternative label
  • Giovannetti V.; Lloyd S.; Maccone L.; Shapiro J.H. (2013)
    Electromagnetic channel capacity for practical purposes
    in Nature photonics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giovannetti V.; Lloyd S.; Maccone L.; Shapiro J.H. (literal)
Pagina inizio
  • 834 (literal)
Pagina fine
  • 838 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84885021579&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 7 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 10 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, piazza dei Cavalieri 7, I-56126 Pisa, Italy; Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Dipartimento Fisica 'A. Volta', University of Pavia, via Bassi 6, I-27100 Pavia, Italy; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States (literal)
Titolo
  • Electromagnetic channel capacity for practical purposes (literal)
Abstract
  • What is the maximum rate at which digital information can be communicated without error using electromagnetic signals, such as radio communication? According to Shannon theory this rate is the capacity of the communication channel, which is obtained by maximizing the mutual information between the channel's input and output. Shannon theory, however, has been developed within classical physics, whereas electromagnetic signals are, ultimately, quantum-mechanical entities. To account for this fact, the capacity must be expressed in terms of a complicated optimization of the Holevo information, but explicit solutions are still unknown for arguably the most elementary electromagnetic channel, the one degraded by additive thermal noise. We place bounds on the thermal channel's Holevo information that determine the capacity up to corrections that are insignificant for practical scenarios such as those with high noise or low transmissivity. Our results apply to any bosonic thermal-noise channel, including electromagnetic signalling at any frequency. © 2013 Macmillan Publishers Limited. (literal)
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