Twisted-light waves transmitted in air over a 3-kilometer path

http://www.kurzweilai.net/twisted-light-waves-transmitted-in-air-over-a-3-kilometer-path?utm_source=KurzweilAI+Daily+Newsletter&utm_campaign=2547c5ecc1-UA-946742-1&utm_medium=email&utm_term=0_6de721fb33-2547c5ecc1-281903081

"The light can be theoretically twisted with an infinite number of turns, with each configuration acting as a single communication channel ... a number of experiments using twisted light over fiber-optic links, some showing that twisted-light can be used to transmit 2.5 terabits of data per second."