Physicists watch quantum particles tunnel through solid barriers. Here's what they found.

The quantum world is a pretty wild one, where the seemingly impossible happens all the time: Teensy objects separated by miles are tied to one another, and particles can even be in two places at once. But one of the most perplexing quantum superpowers is the movement of particles through seemingly impenetrable barriers.

Now, a team of physicists has devised a simple way to measure the duration of this bizarre phenomenon, called quantum tunneling. And they figured out how long the tunneling takes from start to finish — from the moment a particle enters the barrier, tunnels through and comes out the other side, they reported online July 22 in the journal Nature

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