A group of computer scientists in Vienna have built a computer network that uses quantum encryption for its security. And it is not a lab toy. There is some 200 km of fiber optic cable linking six locations in Vienna and a nearby town. Impressive stuff. And allegedly unbreakable security.

Update: Apparently the “unbreakable” security has been cracked already. Stories here and here. And apologies to DrJon for our spam trap having eaten his comment.