Fundamental rate-loss tradeoff for optical quantum key distribution

Masahiro Takeoka, Saikat Guha, Mark M. Wilde

研究成果: Article査読

196 被引用数 (Scopus)

抄録

Since 1984, various optical quantum key distribution (QKD) protocols have been proposed and examined. In all of them, the rate of secret key generation decays exponentially with distance. A natural and fundamental question is then whether there are yet-to-be discovered optical QKD protocols (without quantum repeaters) that could circumvent this rate-distance tradeoff. This paper provides a major step towards answering this question. Here we show that the secret key agreement capacity of a lossy and noisy optical channel assisted by unlimited two-way public classical communication is limited by an upper bound that is solely a function of the channel loss, regardless of how much optical power the protocol may use. Our result has major implications for understanding the secret key agreement capacity of optical channels - a long-standing open problem in optical quantum information theory - and strongly suggests a real need for quantum repeaters to perform QKD at high rates over long distances.

本文言語English
論文番号5235
ジャーナルNature communications
5
DOI
出版ステータスPublished - 2014 10 24
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 生化学、遺伝学、分子生物学(全般)
  • 物理学および天文学(全般)

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