Einstein called it βspooky action at a distance,β but today quantum entanglement is poised to revolutionize technology from computers to cryptography. Physicists have gradually become convinced that the phenomenonβtwo subatomic particles that mirror changes in each other instantaneously over any distanceβis real. But a few doubts remain. NOVA follows a ground-breaking experiment in the Canary Islands to use quasars at opposite ends of the universe to once and for all settle remaining questions.
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