Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Necessary and sufficient condition for saturating the upper bound of
  quantum discord   We revisit the upper bound of quantum discord given by the von Neumann
entropy of the measured subsystem. Using the Koashi-Winter relation, we obtain
a trade-off between the amount of classical correlation and quantum discord in
the tripartite pure states. The difference between the quantum discord and its
upper bound is interpreted as a measure on the classical correlative capacity.
Further, we give the explicit characterization of the quantum states saturating
the upper bound of quantum discord, through the equality condition for the
Araki-Lieb inequality. We also demonstrate that the saturating of the upper
bound of quantum discord precludes any further correlation between the measured
subsystem and the environment.

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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
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The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg