Research NewsQuantum Mechanics

Quantum Spookiness Wins, Einstein Loses in Photon Test

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Science  25 Jul 1997:
Vol. 277, Issue 5325, pp. 481
DOI: 10.1126/science.277.5325.481

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Among quantum theory's oddest claims is that the states of two particles or photons can influence each other no matter how far apart they are, providing their quantum states are "entangled." A measurement on one photon will then influence the outcome of a measurement on its distant twin. Some theorists have questioned this claim, but a group of researchers has enlisted fiber-optic lines belonging to the Swiss telephone system to show that links between quantum entities persist over distances of more than 10 kilometers.