Point-to-point free-space quantum cryptography over 1/2 km
W. T. Buttler, Richard Hughes, Paul G. Kwiat, S. K. Lamoreaux, George L. Morgan, J. E. Nordholt, Charles G. Peterson · 2003
Summary form only given. We have demonstrated a point-to-point single photon quantum cryptographic key distribution over a free-space optical path of /spl sim/475 m (>1,000 times farther than any reported point-to-point demonstration, and >6 times the previous daylight transmission distance), under both daylight and nighttime conditions. Within the next few months, we expect to extend the daylight range to 2 km. A brief description of the system is given here.