Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Propagation of entangled light pulses through dispersive and absorbing
  channels   The modification of initially entangled light pulses passing through
dispersive and absorbing four-port devices is studied, using recently obtained
results on quantum state transformations [Phys. Rev. A 59, 4716 (1999)]. The
fidelity and indices of quantum correlations based on the von Neumann entropy
are calculated. Their dependence on both the pulse shape and the four-port
device parameters is studied. It is shown, that due to dispersion and
absorption the quantum correlations are reduced substantially for large initial
entanglement.

28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas