Free-space quantum key distribution over 144 km

Details Free-space quantum key distribution over 144 km Free-space quantum key distribution over 144 km

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6399e..14f&link_type=abstract

Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems

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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.

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