Thursday, August 14, 2008


The latest in quantum entanglement...

Quantum weirdness even stranger than previously thought.

Two photons can be connected in a way that seems to defy the very nature of space and time, yet still obeys the laws of quantum mechanics.

Physicists at the University of Geneva achieved the weird result by creating a pair of ‘entangled’ photons, separating them, then sending them down a fibre optic cable to the Swiss villages of Satigny and Jussy, some 18 kilometres apart.

The researchers found that when each photon reached its destination, it could instantly sense its twin’s behaviour without any direct communication. The finding does not violate the laws of quantum mechanics, the theory that physicists use to describe the behaviour of very small systems. Rather, it shows just how quantum mechanics can defy everyday expectation, says Nicolas Gisin, the researcher who led the study. “Our experiment just puts the finger where it hurts,” he says. The study is published in Nature1.

continued in Nature


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