 passing through
each of them in succession. Detection of a subsequent pulse verifies the effect.)
CESIUM CLOUDS ARE ENTANGLED by the quantum imprint of a laser pulse (red) passing through
each of them in succession. Detection of a subsequent pulse verifies the effect.
Image: SARA CHEN
Schr¿dinger considered it the most profound feature of quantum mechanics, and Einstein disbelievingly called it "spooky action at a distance." Entanglement, long just a controversial plaything for theorists, is the weird phenomenon whereby the quantum states of two or more objects become intrinsically entwined in a partnership that in theory would remain unbroken across a distance of light-years. Previously achieved with only a few particles at a time, this marvel has now been demonstrated with two golfball-size clouds of cesium containing trillions of atoms. Eugene S. Polzik and his co-workers at the University of ¿rhus in Denmark entangled the cesium clouds by shooting laser pulses through them. The process will enable robust new ways to teleport quantum states and store information in quantum memories, an essential element of the emerging technology of quantum computation.
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