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"We consider two interacting systems when one is treated classically while the other system remains quantum. Consistent dynamics of this coupling has been shown to exist, and explored in the context of treating space-time classically. Here, we prove that any such hybrid dynamics necessarily results in decoherence of the quantum system, and a breakdown in predictability in the classical phase space."

Oppenheim, J., Sparaciari, C., Ε oda, B. et al. Gravitationally induced decoherence vs space-time diffusion: testing the quantum nature of gravity. Nat Commun 14, 7910 (2023). doi.org/10.1038/s41467-023-433 @physics @science

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