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A Stronger Theorem Against Macro-realism
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DOI：10.22331/q-2017-07-14-13.png)
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Abstract
En 中文
Macro-realism is the position that certain macroscopic observables must always possess definite values: e.g. the table is in some definite position, even if we dont know what that is precisely. The traditional understanding is that by assuming macro-realism one can derive the Leggett-Garg inequalities, which constrain the possible statistics from certain experiments. Since quantum experiments can violate the Leggett-Garg inequalities, this is taken to rule out the possibility of macro-realism in a quantum universe. However, recent analyses have exposed loopholes in the Leggett-Garg argument, which allow many types of macro-realism to be compatible with quantum theory and hence violation of the Leggett-Garg inequalities. This paper takes a different approach to ruling out macro-realism and the result is a no-go theorem for macro-realism in quantum theory that is stronger than the Leggett-Garg argument. This approach uses the framework of ontological models: an elegant way to reason about foundational issues in quantum theory which has successfully produced many other recent results, such as the PBR theorem.
Keywords:
QUANTUM-MECHANICS
MACROSCOPIC REALISM
FLUX
STATE