News of the WeekQuantum Mechanics

Entangled Trio to Put Nonlocality to the Test

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Science  05 Mar 1999:
Vol. 283, Issue 5407, pp. 1429
DOI: 10.1126/science.283.5407.1429a

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One of the strangest claims of quantum mechanics is that two particles can be "entangled"--inextricably linked at birth--so that a measurement on one entangled particle is connected in some mysterious way to a measurement on the other, even if they are far apart. Now Austrian physicists have created the same eerie link among a trio of photons, so that detecting two of the photons preordains the result of the third measurement. The feat should allow researchers to close some loopholes in tests of the strange predictions of quantum mechanics.