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Proceedings Paper

Free-space quantum cryptography for metropolitan areas
Author(s): M. Fürst; T. Schmitt-Manderbach; H. Weier; I. Ordavo; H. Weinfurter
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Paper Abstract

Quantum key distribution (QKD)1 is the first method of quantum information science that will find its way into our everyday life. It employs fundamental laws of quantum physics to ensure provably secure symmetric key generation between two parties. The key can then be used to encrypt and decrypt sensitive data with unconditional security. Here, we report on a free space QKD implementation over a distance of 480 m using strongly attenuated laser pulses. It is designed to work continuously without human interaction. Until now, it produces quantum keys unattended at night for more than 12 hours with a sifted key rate of more than 50 kbit/s on average and a quantum bit error rate between 3% and 5%.

Paper Details

Date Published: 16 October 2006
PDF: 6 pages
Proc. SPIE 6399, Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays, 63990I (16 October 2006); doi: 10.1117/12.690184
Show Author Affiliations
M. Fürst, Ludwig Maximilian Univ., Munich (Germany)
T. Schmitt-Manderbach, Ludwig Maximilian Univ., Munich (Germany)
Max-Planck Institute for Quantum Optics (Germany)
H. Weier, Ludwig Maximilian Univ., Munich (Germany)
I. Ordavo, Ludwig Maximilian Univ., Munich (Germany)
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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