The Weird Quantum Behavior of Light, Captured in a Lab

March 4, 2015 7:43 PM

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Subatomic particles—photons, let’s say, or electrons—sometimes also act like waves. And waves sometimes act like subatomic particles. It’s weird. It’s also one of the fundamental tenets of quantum physics…and now, for the first time, scientists have taken a picture of that duality at work.

Other experiments have confirmed this two-faced behavior. As far back as the 19th century, physicists learned that if they shined a dim light—which is to say, few photons—at two super-narrow slits, a screen on the other side shows that photons go through one or the other. But crank up the amount of ...

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