Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetically Induced Transparency in optically trapped rubidium
  atoms   We demonstrate electromagnetically induced transparency (EIT) in a sample of
rubidium atoms, trapped in an optical dipole trap. Mixing a small amount of
$\sigma^-$-polarized light to the weak $\sigma^+$-polarized probe pulses, we
are able to measure the absorptive and dispersive properties of the atomic
medium at the same time. Features as small as 4 kHz have been detected on an
absorption line with 20 MHz line width.

19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga