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Schrödinger ‘s cat

The cat is back: Is quantum theory dead, alive, AND contradicting itself?

No, we wouldn’t pay any attention either except that the story is from Nature and they don’t do April 1 in September: In the world’s most famous thought experiment, physicist Erwin Schrödinger described how a cat in a box could be in an uncertain predicament. The peculiar rules of quantum theory meant that it could be both dead and alive, until the box was opened and the cat’s state measured. Now, two physicists have devised a modern version of the paradox by replacing the cat with a physicist doing experiments — with shocking implications. Quantum theory has a long history of thought experiments, and in most cases these are used to point to weaknesses in various interpretations of quantum mechanics. Read More ›