Quantum state majorization at the output of bosonic gaussian channels (Articolo in rivista)

Type
Label
  • Quantum state majorization at the output of bosonic gaussian 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/ncomms4826 (literal)
Alternative label
  • Mari A.[ 1,2 ]; Giovannetti V.[ 1,2 ]; Holevo A.S.[ 3,4 ] (2014)
    Quantum state majorization at the output of bosonic gaussian channels
    in Nature communications
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mari A.[ 1,2 ]; Giovannetti V.[ 1,2 ]; Holevo A.S.[ 3,4 ] (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84900024188&partnerID=q2rCbXpz (literal)
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  • 5 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 3826 (literal)
Note
  • Scopu (literal)
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  • [ 1 ] Scuola Normale Super Pisa, NEST, I-56127 Pisa, Italy [ 2 ] CNR, Ist Nanosci, I-56127 Pisa, Italy [ 3 ] VA Steklov Math Inst, Moscow 119991, Russia [ 4 ] Natl Res Univ, Higher Sch Econ, Moscow 101000, Russia (literal)
Titolo
  • Quantum state majorization at the output of bosonic gaussian channels (literal)
Abstract
  • Quantum communication theory explores the implications of quantum mechanics to the tasks of information transmission. Many physical channels can be formally described as quantum Gaussian operations acting on bosonic quantum states. Depending on the input state and on the quality of the channel, the output suffers certain amount of noise. For a long time it has been conjectured, but never proved, that output states of Gaussian channels corresponding to coherent input signals are the less noisy ones (in the sense of a majorization criterion). Here we prove this conjecture. Specifically we show that every output state of a phase-insensitive Gaussian channel is majorized by the output state corresponding to a coherent input. The proof is based on the optimality of coherent states for the minimization of strictly concave output functionals. Moreover we show that coherent states are the unique optimizers. © 2014 Macmillan Publishers Limited. All rights reserved. (literal)
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