Classical-quantum gravity with completely positive dynamics admits an embedding into a fully quantum theory on an enlarged Hilbert space, illustrated by a hybrid qubit-classical particle system that violates angular momentum conservation despite rotational symmetry.
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quant-ph 2years
2025 2verdicts
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Collapse-based models of gravity are shown to be nonlocal, thereby preserving the validity of the entanglement-based witness for the non-classicality of gravity.
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Classical-quantum gravity as quantum gravity in disguise
Classical-quantum gravity with completely positive dynamics admits an embedding into a fully quantum theory on an enlarged Hilbert space, illustrated by a hybrid qubit-classical particle system that violates angular momentum conservation despite rotational symmetry.
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Collapse-based models for gravity do not violate the entanglement-based witness of non-classicality
Collapse-based models of gravity are shown to be nonlocal, thereby preserving the validity of the entanglement-based witness for the non-classicality of gravity.