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Yes. The fundamental energy requirements come out of the destruction of information from a bit flip (or from a 2 bit -> 1 bit gate). Qubits don't undergo that transition - until the final measurement, they're in a superposition of both states, so the transformations are really just rotations and reflections of a state, which in principle are not subject to the same requirements. Also, the real power of quantum computing comes from the ability to 'test multiple answers' at once, at least in principle. In reality, we've only figured out how to do this for a small subclass of problems.



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