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Nature 412, 866-868 (30 August 2001) | doi:10.1038/35091173

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Quantum optics: Photons yield to peer pressure

Paul Kwiat

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In 1960 the invention of the laser allowed classical light to be amplified inside a cavity. New experiments show that photons in a special quantum state can also be amplified.

Quantum entanglement between two particles means that measuring the behaviour of one instantly determines the behaviour of the other, even when they are physically far apart. Erwin Schrödinger once described this peculiar connection as "the characteristic trait of quantum mechanics, the one that enforces its entire departure from classical lines of thought".