Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Background atoms and decoherence in optical lattices   All experiments with ultracold atoms are performed in the presence of
background residual gas. With the help of a suitable master equation we
investigate a role of these fast atoms on the loss of coherence in optical
lattices. We present an exact solution of the master equation and give the
analytic formulas for all correlation functions in the presence of one body
losses. Additionally we discuss existing of a Schr\"odinger cat state predicted
in this system in [1].

25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex