Quantum capacity of dephasing channels with memory (Articolo in rivista)

Type
Label
  • Quantum capacity of dephasing channels with memory (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • D'Arrigo, A; Benenti, G; Falci, G (2007)
    Quantum capacity of dephasing channels with memory
    in New journal of physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • D'Arrigo, A; Benenti, G; Falci, G (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 9 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Studi Catania, CNR, MATIS INFM, Dipartimento Metodol Fis Chim Ingegneria, Catania 95125, Italy; CNR, Univ Studi Insurbia, Ctr Nonlinear Complex Syst, CNISM INFM, I-00185 Rome, Italy; Ist Nazl Fis Nucl, I-20133 Milan, Italy (literal)
Titolo
  • Quantum capacity of dephasing channels with memory (literal)
Abstract
  • We show that the amount of coherent quantum information that can be reliably transmitted down a dephasing channel with memory is maximized by separable input states. In particular, we model the channel as a Markov chain or a multimode environment of oscillators. While in the first model, the maximization is achieved for the maximally mixed input state, in the latter it is convenient to exploit the presence of a decoherence-protected subspace generated by memory effects. We explicitly compute the quantum channel capacity for the first model while numerical simulations suggest a lower bound for the latter. In both cases memory effects enhance the coherent information. We present results valid for arbitrary input size. (literal)
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