Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Remarks on the classical capacity of quantum channel   A direct proof of the relation between the one-shot classical capacity and
the minimal output entropy for covariant quantum channels is suggested. The
structure of covariant channels is described in some detail. A simple proof of
a general inequality for entanglement-assisted classical capacity is given.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci