News FocusQuantum Mechanics

'Spooky Action' Passes a Relativistic Test

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Science  17 Mar 2000:
Vol. 287, Issue 5460, pp. 1909-1910
DOI: 10.1126/science.287.5460.1909

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The most unnerving idea in quantum mechanics may be "spooky action at a distance"--the notion that certain particles can affect one another almost instantly across vast reaches of space. Recently in Geneva, that aspect of quantum surreality survived the most cunning trap so far, a series of experiments that pitted it against basic principles of Einstein's relativity. The results gave the most accurate estimate yet of how rapidly the "spooky action" might operate.