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Proceedings Paper

Detecting quantum correlations for quantum key distribution
Author(s): Marcos Curty; Otfried Guehne; Maciej Lewenstein; Norbert Luetkenhaus
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Paper Abstract

Practical quantum key distribution can be understood as a two-step procedure: in a first step two parties exchange quantum mechanical signals and perform measurements on them, in a second step auxiliary classical communication protocols are performed over an authenticated public channel to transform the data of the first step into an information-theoretic secure key. In this article we address the question of necessary conditions on the correlated (classical) data of the first step such that there can be a successful second step at all. As it turns out, a necessary condition is that these data, together with the knowledge about the physical set-up of sender and receiver, allow to establish a proof of effective entanglement between the two parties. We then demonstrate methods to systematically search for such a proof in basic settings, involving the 2-, 4-, and 6-state protocols.

Paper Details

Date Published: 11 January 2005
PDF: 11 pages
Proc. SPIE 5631, Quantum Optics and Applications in Computing and Communications II, (11 January 2005); doi: 10.1117/12.575411
Show Author Affiliations
Marcos Curty, Friedrich-Alexander Univ. Erlangen-Nuernberg (Germany)
Otfried Guehne, Univ. Hannover (Germany)
Osterreichische Akademie der Wissenschaften (Austria)
Maciej Lewenstein, Univ. Hannover (Germany)
Norbert Luetkenhaus, Friedrich-Alexander Univ. Erlangen-Nuernberg (Germany)

Published in SPIE Proceedings Vol. 5631:
Quantum Optics and Applications in Computing and Communications II
Guang-Can Guo; Hoi-Kwong Lo; Masahide Sasaki; Songhao Liu, Editor(s)

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