A step towards global key distribution

C Kurtseifer, M Halder, P Zarda, H Weinfurter, P.R. Tapster, JG Rarity

Research output: Contribution to journalArticle (Academic Journal)peer-review

337 Citations (Scopus)


Large random bit-strings known as 'keys' are used to encode and decode sensitive data, and the secure distribution of these keys is essential to secure communications across the globe1. Absolutely secure key exchange2 between two sites has now been demonstrated over fibre3 and free-space4, 5, 6 optical links. Here we describe the secure exchange of keys over a free-space path of 23.4 kilometres between two mountains. This marks a step towards accomplishing key exchange with a near-Earth orbiting satellite and hence a global key-distribution system.
Translated title of the contributionA step towards global key distribution
Original languageEnglish
Pages (from-to)450 - 450
Number of pages1
Volume419 (6906)
Publication statusPublished - Oct 2002

Structured keywords

  • Photonics and Quantum


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