Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing quantum correlations in a confined atomic cloud by scattering
  fast atoms: Direct and time reversed processes   We suggest measuring the one-particle density matrix of a trapped ultracold
atomic cloud by scattering fast atoms in a pure momentum state off the cloud.
The lowest-order probability for the process, resulting in a pair of outcoming
fast atoms for each incoming one, as well as of its time reversed counterpart,
turns out to be given by the Fourier transform of the density matrix.
Accordingly, important information about quantum correlations can be deduced
directly from the differential scattering cross-section of these processes.
Several most interesting cases of scattering - from a single condensate
containing a vortex, and from a split condensate characterized by some phase
difference - are discussed.

33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin