Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Concurrence and Entanglement of Rank Two Channels   Concurrence and further entanglement quantifyers can be computed explicitly
for channels of rank two if representable by just two Kraus operators. Almost
all details are available for the subclass of rank two 1-qubit-channels. There
is a simple geometric picture beyond, explaining nicely the role of
anti-linearity.

21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph