Daylight Quantum Key Distribution over 1.6 km
W. T. Buttler, Richard Hughes, S. K. Lamoreaux, George L. Morgan, J. E. Nordholt, Charles G. Peterson · Physical Review Letters · 2000
Quantum key distribution (QKD) has been demonstrated over a point-to-point 1.6-km atmospheric optical path in full daylight. This record transmission distance brings QKD a step closer to surface-to-satellite and other long-distance applications.