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Some time far into the future, humans have made the technology breakthroughs to construct decoherence-proof reversible quantum computers with quantum fault tolerance. They have also solved the hard AI problem. They program a quantum conscious being on such a computer and also a two state quantum system. The quantum conscious being is programmed to entangle with the quantum system, measuring it. The rules of the Copenhagen interpretation tell us the state of the quantum system happened. The programmers reverse the program, undoing the measurement, with all the memory wiped clean. Did the quantum system unhappen?

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Let's wait till that "Deepest Q-Thought" will be built. –  Georg May 27 '11 at 17:55
Yeah, this is way too speculative as is. –  David Z May 28 '11 at 5:14
This should be reopened, it is not too hard to answer, and the question can be restricted to reversible computations without quantum mechanics, making it less futuristic. –  Ron Maimon Aug 31 '11 at 4:14
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closed as not a real question by Georg, David Z May 28 '11 at 5:13

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.