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Some of the most perplexing topics in physics revolve around quantum theory. The quandary is seen most famously in the Schrödinger’s cat question and the issue of information loss in black hole evaporation. Richard Feynman said, “I think that I can safely say that nobody understands quantum mechanics.” Most physicists have just gotten used to it. There’s no doubt quantum theory is successful at the practical level. But when considering it as more than a tool for calculating probabilities for possible outcomes of experiments in the laboratory, and taking it as a fundamental description of the “world out there,” it faces serious conceptual problems.
The basic problem is that quantum theory seems to be about what we measure and not about what is out there in the world. One might think this is just fine, as the theory represents just “our information” about the world. But that would make sense only if there were something about the world that we can be informed of, which must be, in general situations, specified by the theory. Understanding how to deal with this conceptual problem requires us to look at the theory in more detail.
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