Structured optical receivers to attain superadditive capacity and the Holevo limit

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

Attaining the ultimate (Holevo) limit to the classical capacity of a quantum channel requires the receiver to make joint measurements over long code-word blocks. For a pure-state channel, we show that the Holevo limit can be attained by a receiver that uses a multisymbol unitary transformation on the quantum code word followed by separable projective measurements. We show a concatenated coding and joint-detection architecture to approach the Holevo limit. We then construct some of the first concrete examples of codes and structured joint-detection receivers for the lossy bosonic channel, which can achieve fundamentally higher (superadditive) capacity than conventional receivers that detect each modulation symbol individually. We thereby pave the way for research into codes and structured receivers for reliable communication data rates approaching the Holevo limit.

Original languageEnglish (US)
Article number240502
JournalPhysical review letters
Volume106
Issue number24
DOIs
StatePublished - Jun 14 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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