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Proceedings Paper

Free-space quantum key distribution over 144 km
Author(s): M. Fürst; H. Weier; T. Schmitt-Manderbach; R. Ursin; F. Tiefenbacher; T. Scheidl; M. Lindenthal; B. Blauensteiner; T. Jennewein; P. Trojek; J. M. Perdigues; Z. Sodnik; C. Barbieri; J. G. Rarity; A. Zeilinger; H. Weinfurter
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Paper Abstract

We report on the experimental implementation of a BB84-type quantum key distribution protocol over a 144 km free-space link using weak coherent laser pulses. The security was assured by employing decoy state analysis, and optimization of the link transmission was achieved with bi-directional active telescope tracking. This enabled us to distribute a secure key at a rate of 11 bits/s at an attenuation of about 35dB. Utilizing a simple transmitter setup and an optical ground station capable of tracking spacecraft in low earth orbit, this outdoor experiment demonstrates the feasibility of global key distribution via satellites.

Paper Details

Date Published: 16 October 2006
PDF: 7 pages
Proc. SPIE 6399, Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays, 63990G (16 October 2006); doi: 10.1117/12.690174
Show Author Affiliations
M. Fürst, Ludwig Maximilian Univ., Munich (Germany)
H. Weier, Ludwig Maximilian Univ., Munich (Germany)
T. Schmitt-Manderbach, Ludwig Maximilian Univ., Munich (Germany)
Max-Planck Institute for Quantum Optics (Germany)
R. Ursin, Univ. of Vienna (Austria)
F. Tiefenbacher, Univ. of Vienna (Austria)
T. Scheidl, Univ. of Vienna (Austria)
M. Lindenthal, Univ. of Vienna (Austria)
B. Blauensteiner, Univ. of Vienna (Austria)
T. Jennewein, Univ. of Vienna (Austria)
P. Trojek, Max-Planck Institute for Quantum Optics (Germany)
J. M. Perdigues, European Space Agency (Netherlands)
Z. Sodnik, European Space Agency (Netherlands)
C. Barbieri, Univ. of Padova (Italy)
J. G. Rarity, Univ. of Bristol (United Kingdom)
A. Zeilinger, Univ. of Vienna (Austria)
H. Weinfurter, Ludwig Maximilian Univ., Munich (Germany)
Max-Planck Institute for Quantum Optics (Germany)


Published in SPIE Proceedings Vol. 6399:
Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays
Lars J. Sjöqvist; Rebecca Wilson, Editor(s)

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