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Vlatko Vedral
University of Oxford, UK
The answer depends on how you think about quantum gravity. If you think that the black hole destroys information irreversibly (i.e. that classical gravity “wins” over quantum mechanics), then the entanglement between the particles is gone. If, on the other hand, you think that black holes obey quantum mechanics, then entanglement persists, though how exactly would depend on the dynamics of the particle inside the black hole and during the eventual evaporation of the black hole. At present, we don’t have a definitive answer because we lack a quantum theory of gravity.
Martin Bastone
East Grinstead, West Sussex, UK
One particle would think it had been ghosted and the one that fell into the black hole would form a new entanglement with Schrödinger’s cat!
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