Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discord Derived from Tsallis Entropy   Due to some ambiguity in defining mutual Tsallis entropy in the classical
probability theory, its generalization to quantum theory is discussed and, as a
consequence, two types of generalized quantum discord, called $q$-discords, are
defined in terms of quantum Tsallis entropy. $q$-discords for two-qubit Werner
and isotropic states are calculated and it is shown that one of them is
positive, at least for states under investigation, for all $q>0$. Finally, an
analytical expression for $q$-discord of certain family of two-qubit X states
is presented.

21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int