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Nature 409, 27-28 (4 January 2001) | doi:10.1038/35051193

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Quantum engineering: Squeezing entanglement

Nick Bigelow

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Quantum entanglement between two particles is a spooky connection that means measuring one has an instant effect on the other. Connecting many atoms in this way would be the first step towards a quantum computer.

If a street magician with two identical coins told you he could predict which way up your coin would land — heads or tails — simply by tossing his coin first, you probably wouldn't believe him. But what if he told you that, because of the laws of physics, your toss had to turn out the same as his toss?