Vindication of entanglement-based witnesses of non-classicality in hybrid systems
Recently, Vedral and one of us proposed an entanglement-based witness of non-classicality in systems that need not obey quantum theory, based on information-theoretic ideas [1, 3], which offers a robust foundation for newly proposed table-top tests of non-classicality in gravity, [2, 3]. The witness asserts that if a mediator can entangle locally two quantum systems, then it has to be non-classical. Hall and Reginatto [4, 7] 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.