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There exists a sequence of barriers through which we must pass to make it so.

First, there are the laws of physics. We cannot send information faster than the speed of light. There are fundamental limits as to the amount of information we can store in a given space. Thermodynamics presents considerable engineering challenges particularly as we craft smaller devices.

Next, there is the challenge of computability. We must turn theory into algorithms, and at scale we must make those algorithms fast and efficient.