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- W3202641710 abstract "We propose delayed choice experiments carried out with macroscopic qubits, realised as macroscopically-distinct coherent states $|alpharangle$ and $|-alpharangle$. Quantum superpositions of $|alpharangle$ and $|-alpharangle$ are created via a unitary interaction $U(theta)$ based on a nonlinear Hamiltonian. Macroscopic delayed-choice experiments give a compelling reason to develop interpretations not allowing macroscopic retrocausality (MrC). We therefore consider weak macroscopic realism (wMR), which specifies a hidden variable $lambda_{theta}$ to determine the macroscopic qubit value (analogous to 'which-way' information), independent of any future measurement setting $phi$. Using entangled states, we demonstrate a quantum eraser where the choice to measure a which-way or wave-type property is delayed. Consistency with wMR is possible, if we interpret the macroscopic qubit value to be determined by $lambda_{theta}$ without specification of the state at the level of $hbar$, where fringes manifest. We then demonstrate violations of a delayed-choice Leggett-Garg inequality, and of the dimension witness inequality applied to the Wheeler-Chaves-Lemos-Pienaar experiment, where measurements need only distinguish the macroscopic qubit states. This negates all two-dimensional non-retrocausal models, thereby suggesting MrC. However, one can interpret consistently with wMR, thus avoiding MrC, by noting extra dimensions, and by noting that the violations require further unitary dynamics $U$ for each system. The violations are then explained as failure of deterministic macroscopic realism (dMR), which specifies validity of $lambda_{theta}$ prior to the dynamics $U(theta)$ determining the measurement setting $theta$. Finally, although there is consistency with wMR for macroscopic observations, we demonstrate EPR paradoxes at a microscopic level." @default.
- W3202641710 created "2021-10-11" @default.
- W3202641710 creator A5074531891 @default.
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- W3202641710 date "2022-06-08" @default.
- W3202641710 modified "2023-09-26" @default.
- W3202641710 title "Macroscopic delayed choice and retrocausality: Quantum eraser, Leggett-Garg, and dimension witness tests with cat states" @default.
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- W3202641710 doi "https://doi.org/10.1103/physreva.105.062209" @default.
- W3202641710 hasPublicationYear "2022" @default.
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