World's first demonstration of space quantum communication using a microsatellite. The world's smallest and lightest quantum-communication transmitter has now been developed, report researchers who have succeeded in the demonstration of the first quantum- communication experiment from space, receiving information from the satellite in a single-photon regime in an optical ground station in Koganei city. This is a major step toward building a global long-haul and truly-secure satellite communication network. Source 6e.