David Kirkpatrick

May 21, 2010

Quantum information sent over 16 kilometers

A major distance breakthrough in “teleporting” quantum entanglement.

From the link:

Scientists in China have succeeded in teleporting information between photons further than ever before. They transported quantum information over a free space distance of 16 km (10 miles), much further than the few hundred meters previously achieved, which brings us closer to transmitting information over long distances without the need for a traditional signal.

Quantum teleportation is not the same as the teleportation most of us know from science fiction, where an object (or person) in one place is “beamed up” to another place where a perfect copy is replicated. In quantum teleportation two photons or ions (for example) are entangled in such a way that when the  of one is changed the state of the other also changes, as if the two were still connected. This enables  to be teleported if one of the photons/ions is sent some distance away.