Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon cooling by dispersive atom-field coupling with atomic
  postselection   We propose, in a Ramsey interferometer, to cool the cavity field to its
ground state, starting from a thermal distribution by a dispersive atom-field
coupling followed by an atomic postselection. We also analyze the effect of the
cavity and atomic losses. The proposed experiment can be realized with
realistic parameters with high fidelity.

2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th