Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bound entanglement maximally violating Bell inequalities: quantum
  entanglement is not equivalent to quantum security   It is shown that Smolin four-qubit bound entangled states [Phys. Rev. A, 63
032306 (2001)] can maximally violate two-setting Bell inequality similar to
standard CHSH inequality. Surprisingly this entanglement does not allow for
secure key distillation, so neither entanglement nor violation of Bell
inequalities implies quantum security. It is also pointed out how that kind of
bound entanglement can be useful in reducing communication complexity.

2
The categories of this paper are: math
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: stat
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph