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- W3121556962 abstract "Violation of Leggett-Garg inequalities allows proof of the incompatibility between quantum mechanics and the combined premises (called macrorealism) of macroscopic realism (MR) and non-invasive measurability (NIM). Arguments can be given that the incompatibility arises because MR fails $-$ or else, that NIM fails. In this paper, we consider a strong failure of macrorealism, involving superpositions of coherent states, where the NIM premise is replaced by Bell-locality. We follow recent work and propose validity of a subset of Einstein-Podolsky-Rosen (EPR) and Leggett-Garg premises, referred to as emph{weak macroscopic realism} (wMR). In finding consistency with wMR, we identify that the Leggett-Garg inequalities are violated because of failure of both MR and NIM, but also that both are valid in a less restrictive sense. Weak MR is distinguished from emph{deterministic macroscopic realism} (dMR) by recognizing that a measurement involves a reversible unitary interaction that establishes the measurement setting. Weak MR posits a predetermined value for the measurement outcome, for the system defined at the time after the interaction, when the measurement setting is experimentally specified. An extended definition of wMR considers the element of reality defined by EPR for a system A, where one can predict with certainty the outcome of a measurement on A, by measurement on a system B. Weak MR posits that the element of reality exists once the unitary interaction determining the setting at B has occurred. We show compatibility of systems violating Leggett-Garg inequalities with wMR, but point out that dMR is falsifiable. We compare with other MR models, and give an argument for wMR on the basis that wMR resolves inconsistencies pointed out by Leggett and Garg between failure of macrorealism and assumptions intrinsic to quantum measurement theory." @default.
- W3121556962 created "2021-02-01" @default.
- W3121556962 creator A5074531891 @default.
- W3121556962 creator A5077384051 @default.
- W3121556962 date "2021-01-23" @default.
- W3121556962 modified "2023-09-25" @default.
- W3121556962 title "Weak versus deterministic macroscopic realism, and Einstein-Podolsky-Rosen's elements of reality" @default.
- W3121556962 cites W3003414507 @default.
- W3121556962 doi "https://doi.org/10.48550/arxiv.2101.09476" @default.
- W3121556962 hasPublicationYear "2021" @default.
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