Back in 1935, Albert Einstein had thrown down a gauntlet to the champions of quantum theory. He had realized that if quantum theory were true it should be possible for two photons separated to opposite sides of the Universe to influence each other. This was such a blatant contradiction of special relativity that he was sure that his EPR paper on this ‘quantum entanglement’ effect would spell the end of quantum physics and a return to sanity. Einstein was rarely wrong when it came to science, but this time he was wonderfully far off the mark.
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