Friday, July 9, 2010

Light memories recall quantum information

BOSTON: Using laser beams and a super cold crystal, Australian researchers stored and retrieved a quantum state of light with 69% efficiency – much higher than that of atomic vapours, used in most quantum computing research.

These findings take researchers one step closer to secure communications: in theory, a quantum computer could send a message that can only be read by one other computer, making it far more secure than today's methods.

It's the unique setup of lasers and crystals that makes the retrieval possible, the researchers said.

One-second memory

"In principle, we could store a whole image - even a holographic image. You could take photo with the lasers, and store it using this crystal," said Matt Sellars of the Australian National University in Canberra.

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