A few days ago, I held a quantum computer in my hand – or did I?

The niobium wafers I saw are the guts of the only commercially available quantum computer, but whether their calculations truly harness the weird world of quantum mechanics has provoked heated debate. Now the chips, made by D-Wave of Burnaby, Canada, have passed two tests that suggest that the bits in their machines have the quantum property of entanglement. That doesn't end the controversy, but it strengthens D-Wave's claim that a revolution in computing is a lot closer than we thought.

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