Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure of quantum and classical implementations of Popescu-Rohrlich
  box   We construct implementations of the PR-box using quantum and classical
channels as state spaces. In both cases our constructions are very similar and
they share the same idea taken from general probabilistic theories and the
square state space model. We construct all quantum qubit channels that
maximally violate a given CHSH inequality, we show that they all are
entanglement-breaking channels, that they have certain block-diagonal structure
and we present some examples of such channels.

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The categories of this paper are: hep-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph