Feed 'Quantum Keys' Sent 200 Kilometers: New Long-distance Record (sciencedaily.com)
Particles of light serving as "quantum keys" -- the latest in encryption technology -- have been sent over a record-setting 200-kilometer fiber-optic link by scientists. The experiment, using mostly standard components and transmitting at telecommunications frequencies, offers an approach for making practical inter-city terrestrial quantum communications networks as well as long-range wireless systems using communication satellites.