Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universal optimal broadband photon cloning and entanglement creation in
  one dimensional atoms   We study an initially inverted three-level atom in the lambda configuration
embedded in a waveguide, interacting with a propagating single-photon pulse.
Depending on the temporal shape of the pulse, the system behaves either as an
optimal universal cloning machine, or as a highly efficient deterministic
source of maximally entangled photon pairs. This quantum transistor operates
over a wide range of frequencies, and can be implemented with today's
solid-state technologies.

5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat