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Casper the Quantum Ghost

A strange kind of imaging relies on quantum mechanics

Casper just got upgraded from the “Friendly Ghost” to the “Quantum Ghost.” In a spooky new study, researchers found telltale signs of quantum weirdness lurking in an optical trick called ghost imaging. Discovered over a decade ago, ghost imaging allows researchers to create an image of something using light that never bounced off the actual object. The new work adds to the debate over whether ghost imaging is quantum in nature, or if normal, everyday physics can explain the phenomenon.

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