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... the superstring theory provides ... comprehensive way of looking at Schrodinder's cat. Usually, in quantum mechanics, physicists write the Schrodinger wave function of a certain particle. However, the complete quantum mechanical description of the superstring theory requires that we write the Schrodinger wave function of the entire universe... This does not resolve all the philosophical problems associated with Schrodinger's cat; it merely means that the original formulation of the problem ... may be incomplete.

Can't we give the same argument just by sticking to our present quantum theory? Why do we need to bring in superstring theory?