Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploring super-radiant phase transitions via coherent control of a
  multi-qubit--cavity system   We propose the use of coherent control of a multi-qubit--cavity QED system in
order to explore novel phase transition phenomena in a general class of
multi-qubit--cavity systems. In addition to atomic systems, the associated
super-radiant phase transitions should be observable in a variety of
solid-state experimental systems, including the technologically important case
of interacting quantum dots coupled to an optical cavity mode.

22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int