# physical theories and computational complexity - reference request

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This question is fairly vague, as I can't recall many of the details. I remember in one of my quantum computing classes the professor mentioning that certain physical theories couldn't be possible because they would conflict with something to do with computational complexity (perhaps some sort of speedup). Does this sound vaguely familiar to anyone? If so, what are some important related papers?
asked Dec 2, 2014

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