Physicists just won the Nobel prize for proving that this is true. I’ve read the articles and don’t get it.
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Remember Shrödinger’s cat? As long as you don’t look in the box, the cat is both alive and dead and only when you open the box the cat “collapses” into either a live or dead cat.
Now imagine the cat has a twin, in another box, also both alive and dead until observed. BUT! Should you look into the first box and the first cat collapses and lives, the other cat **instantly** dies.
That’s what they did in the experiment: they opened the two boxes at exactly the same time, and saw that both cats collapsed into opposite states with seemingly no connection.
Under our previous understanding of a “locally real” universe, there should be some information transfer between them: how else could the cats know each others fate?
This information transfer could only happen at the speed of light, but now this experiment has closed all loopholes in that possibility. The collapse is instant, faster than the speed of light.
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