Vindication of entanglement-based witnesses of non-classicality in hybrid systems

Abstract

Recently, Vedral and one of us proposed an entanglement-based witness of non-classicality in systems that need not obey quantum theory, based on constructor-information-theoretic ideas, which offers a robust foundation for recently proposed table-top tests of non-classicality in gravity. The witness asserts that if a mediator can entangle locally two quantum systems, then it has to be non-classical. Hall and Reginatto claimed that there are classical systems that can entangle two quantum systems, thus violating our proposed witness. Here we refute that claim, explaining that the counterexample proposed by Hall and Reginatto in fact validates the witness, vindicating the witness of non-classicality in its full generality.

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Cited by in corpus (4)

• What gravity mediated entanglement can really tell us about quantum gravity
• Harvesting entanglement from the gravitational vacuum
• Gravitational entanglement and the mass contribution of internal energy in nonrelativistic quantum systems
• Comment on "Vindication of entanglement-based witnesses of non-classicality in hybrid systems"