The Change Mariner

Australian Teleportation Breaktrhough

The Age (Australia):

Superfast computers, unbreakable codes and completely secure communications are a step closer, with Australian scientists demonstrating how to teleport data to multiple receivers.

This follows the major breakthrough two years ago when members of the Australian National University (ANU) Quantum Optics Group demonstrated teleportation of a laser beam between two points.

In a new world first for the rarefied field of quantum physics, they have now proven they can teleport a laser to three recipients.

But the information is only recoverable if any two of the recipients collaborate, in what's called quantum secret sharing.

Group leader Dr Ping Koy Lam said it would be expected that each of three recipients would gain one third of the information. But in quantum physics, that's not what happens.

Rather, each has nothing. But by combining their efforts - in this case their laser beams - any two can recover all the information.

"That's the magic of it," he said. "If any two get together, you get back 100 per cent of the information."

Posted by Timothy Fredel at May 7, 2004 08:20 PM | TrackBack
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