Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mutual information of optical communication in phase conjugating
  Gaussian channels   In all practical communication channels, the code word consist of Gaussian
states and the measurement strategy is often a Gaussian detector such as
homodyning or heterodyning. In this paper we investigate the communication
performance using a phase-conjugated alphabet and joint Gaussian detection in
an phase-insensitive amplifying channel. We find that a communication scheme
consisting of a phase-conjugated alphabet of coherent states and a joint
detection strategy significantly outperforms a standard coherent-state strategy
based in individual detection. Moreover, we show that the performance can be
further enhanced by using entanglement and that the performance is completely
independent on the gain of the phase-insensitively amplifying channel.

15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con