A Stronger Theorem Against Macro-realism
John-Mark A. Allen, Owen J. E. Maroney, Stefano Gogioso

TL;DR
This paper presents a new, stronger no-go theorem against macro-realism in quantum theory, using ontological models to address loopholes in previous Leggett-Garg-based arguments.
Contribution
It introduces a novel approach employing ontological models to establish a more robust no-go theorem against macro-realism.
Findings
Provides a stronger theoretical proof ruling out macro-realism
Addresses and closes loopholes in Leggett-Garg inequalities
Utilizes ontological models for foundational quantum analysis
Abstract
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 don't 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…
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