Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decoherence by spontaneous emission: a single-atom analog of
  superradiance   We show that the stationary decoherence rate of an open quantum system can be
decomposed as a sum of local and nonlocal contributions, respectively related
to the strength of the coupling between system and environment, and to the
quality of the information about the system leaking into the environment. Both
terms arise naturally in the framework of the influence functional, with the
nonlocal term arising from the coupling between the backward and forward
histories describing the open quantum system time evolution. While the local
contribution always yields a positive decoherence rate, the nonlocal one may
lead to recoherence when only partial information about the system is obtained
from the disturbed environment. We illustrate these concepts in the framework
of interferometry with trapped atoms, by analyzing the effect of spontaneous
emission on the coherence of the center-of-mass.

2
The categories of this paper are: math
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics