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26 April 2024

» pubmed » pmid17358463

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Experimental demonstration of free-space decoy-state quantum key distribution over 144 km
Tobias Schmitt-Manderbach ; Henning Weier ; Martin Fürst ; Rupert Ursin ; Felix Tiefenbacher ; Thomas Scheidl ; Josep Perdigues ; Zoran Sodnik ; Christian Kurtsiefer ; John G Rarity ; Anton Zeilinger ; Harald Weinfurter ;
Date:	5 Jan 2007
Journal:	Phys Rev Lett, 98 (1), 010504
Abstract:	We report on the experimental implementation of a Bennett-Brassard 1984 (BB84) protocol type quantum key distribution over a 144 km free-space link using weak coherent laser pulses. Optimization of the link transmission was achieved with bidirectional active telescope tracking, and the security was ensured by employing decoy-state analysis. This enabled us to distribute a secure key at a rate of 12.8 bit/s at an attenuation of about 35 dB. Utilizing a simple transmitter setup and an optical ground station capable of tracking a spacecraft in low earth orbit, this outdoor experiment demonstrates the feasibility of global key distribution via satellites.
Source:	PubMed, pmid17358463
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