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- W4366440799 abstract "One of the basic observations of the classical world is that physical entities are real and can be distinguished from each other. However, within quantum theory, the idea of physical realism is not well established. A framework to analyse how observations in experiments can be described using some physical states of reality was recently developed, known as ontological models framework. Different principles when imposed on the ontological level give rise to different theories, the validity of which can be tested based on the statistics generated by these theories. Using the ontological models framework, we formulate a novel notion of classicality termed ontic-distinguishability, which is based upon the physical principles that in classical theories extremal states are physical states of reality and every sharp measurement observes the state of the system perfectly. We construct a communication task in which the success probability is bounded from above for ontological models satisfying the notion of ontic-distinguishability. Contrary to previous notions of classicality which either required systems of dimension strictly greater than two or atleast three preparations, a violation of ontic-distinguishability can be observed using just a pair of qubits and a pair of incompatible measurements. We further show that violation of previously known notions of classicality such as preparation non-contextuality and Bell's local causality is a violation of ontic-distinguishability." @default.
- W4366440799 created "2023-04-21" @default.
- W4366440799 creator A5021006857 @default.
- W4366440799 date "2023-04-01" @default.
- W4366440799 modified "2023-10-18" @default.
- W4366440799 title "An Operational Notion of Classicality Based on Physical Principles" @default.
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- W4366440799 doi "https://doi.org/10.1007/s10701-023-00687-w" @default.
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