Exceeding the classical capacity limit in a quantum optical channel

Mikio Fujiwara, Masahiro Takeoka, Jun Mizuno, Masahide Sasaki

Research output: Contribution to journalArticlepeer-review

107 Citations (Scopus)


The theory of capacity generally gives no guidance on how to construct codes that approach the capacity. The practical problem is to find good codes for small blocks. Although several coding schemes are proposed to exhibit superadditive coding gain, little attention is paid to this topic so far, and no experimental work is reported yet. This paper experimentally demonstrates the superadditive coding gain by designing a coding circuit for a quantum channel consisting of the ternary symmetric states in a two-state system (qubit) of a single photon.

Original languageEnglish
Article number167906
Pages (from-to)167906/1-167906/4
JournalPhysical review letters
Issue number16
Publication statusPublished - 2003 Apr 25
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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