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Quantum Computing since Democritus by Scott Aaronson

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20 Time travel

In the last chapter, we talked about free will, superintelligent predictors, and Dr. Evil planning to destroy the Earth from his moon base. Now I’d like to talk about a more down-to-earth topic: time travel. The first point I have to make is one that Carl Sagan made: we're all time travelers – at the rate of one second per second! Har har! Moving on, we have to distinguish between time travel into the distant future and into the past. Those are very different.

Travel into the distant future is by far the easier of the two. There are several ways to do it.

  • Cryogenically freeze yourself and thaw yourself out later.
  • Travel at relativistic speed.
  • Go close to a black hole horizon.

This suggests one of my favorite proposals for how to solve ...

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