Last week Toshiba tested a quantum broadband link so secure it's theoretically unbreakable. Now a researcher at the University of New South Wales in Sydney has devised an even more sophisticated quantum scheme that ensures that only a recipient standing in precisely the right location can receive a message.

Last week Toshiba tested a quantum broadband link so secure it's theoretically unbreakable. Now a researcher at the University of New South Wales in Sydney has devised an even more sophisticated quantum scheme that ensures that only a recipient standing in precisely the right location can receive a message.
http://www.popsci.com/technology/article/2010-04/new-quantum-encryption-scheme-ensures-recipients-are-right-place