How do you simulate a quantum gauge theory in a gauge with negative norms on a quantum computer?
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There is a theorem that you can efficiently simulate any quantum system on a quantum computer (and it is known, and all but proven with Shor factoring, that you can't do this with a classical computer), but the computer is restricted to positive norm states
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Explanation:
In the quantum theory, the gauge symmetry is needed to remove various pathologies which arise, such as the presence of negative norm
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