People write this sort of thing a lot, and I don't really understand it. Simulating quantum systems is dramatically (formally speaking exponentially) more expen

People write this sort of thing a lot, and I don't really understand it. Simulating quantum systems is dramatically (formally speaking exponentially) more expensive than simulating classical ones (at least as far as our current understanding of complexity theory goes). If you're going to simulate a universe, and you want to cheap-out on computer power, then you should simulate a classical one.