Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fast compression of a cold atomic cloud using a blue detuned crossed
  dipole trap   We present the experimental realization of a compressible blue detuned
crossed dipole trap for cold atoms allowing for fast dynamical compression (~ 5
- 10 ms) of 5x10^7 Rubidium atoms up to densities of ~ 10^13 cm^-3. The dipole
trap consists of two intersecting tubes of blue-detuned laser light. These
tubes are formed using a single, rapidly rotating laser beam which, for
sufficiently fast rotation frequencies, can be accurately described by a
quasi-static potential. The atomic cloud is compressed by dynamically reducing
the trap volume leading to densities close to the Ioffe-Reggel criterion for
light localization.

15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat