Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cavity QED with an ultracold ensemble on a chip: prospects for strong
  magnetic coupling at finite temperatures   We study the nonlinear dynamics of an ensemble of cold trapped atoms with a
hyperfine transition magnetically coupled to a resonant microwave cavity mode.
Despite the minute single atom coupling one obtains strong coupling between
collective hyperfine qubits and microwave photons enabling coherent transfer of
an excitation between the long lived atomic qubit state and the mode. Evidence
of strong coupling can be obtained from the cavity transmission spectrum even
at finite thermal photon number. The system makes it possible to study further
prominent collective phenomena such as superradiant decay of an inverted
ensemble or the building of a narrowband stripline micromaser locked to an
atomic hyperfine transition.

30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc