Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum discord of X-states as optimization of one variable function   We solve the quantum discord completely as an optimization of certain one
variable function for arbitrary two qubit X state. Exact solutions of the
quantum discord are obtained for several nontrivial regions of the five
parametric space for the quantum state. Exceptional solutions are determined
via an iterative algorithm.

19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci