Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A review on super dense coding over covariant noisy channels   We study the performance of the super dense coding protocol in the presence
of quantum channels with covariant noise. We first consider the bipartite case
and review in a unified way the case of general Pauli channels. We discuss both
the cases of unitary and non-unitary encoding. We also study the multipartite
scenario and investigate the case of many senders and one receiver.

29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th