Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Characterization of Antidegradable Qubit Channels   This paper provides a characterization for the set of antidegradable qubit
channels. The characterization arises from the correspondence between the
antidegradability of a channel and the symmetric extendibility of its Choi
operator. Using an inequality derived to describe the set of bipartite qubit
states which admit symmetric extension, we are able to characterize the set of
all antidegradable qubit channels. Using the characterization we investigate
the antidegradability of unital qubit channels and arbitrary qubit channels
with respect to the dimension of the environment. We additionally provide a
condition which describes qubit channels which are simultaneously degradable
and antidegradable along with a classification of self-complementary qubit
channels.

35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess