Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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
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.

5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn