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Entanglement in the macroworld

‘Spooky action at a distance’ observed in superconductors big enough to be seen with the naked eye

1:48pm, September 23, 2009

By linking the electrical currents of two superconductors large enough to be seen with the naked eye, researchers have extended the domain of observable quantum effects. Billions of flowing electrons in the superconductors can collectively exhibit a weird quantum property called entanglement, usually confined to the realm of tiny particles, scientists report in the Sept. 24 Nature.

“It’s an exciting piece of work,” comments physicist Steven Girvin of Yale University. “People are interested in pushing the boundaries of quantum mechanics.”

Entanglement is one of the strangest consequences of quantum m

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