Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonclassical effects in optomechanics: Dynamics and collapse of
  entanglement   We have investigated a wide range of nonclassical behavior exhibited by a
tripartite cavity optomechanical system comprising a two-level atom placed
inside a Fabry-P\'{e}rot type optical cavity with a vibrating mirror attached
to one end. We have shown that the atom's subsystem von Neumann entropy
collapses to its maximum allowed value over a significant time interval during
dynamical evolution. This feature is sensitive to the nature of the initial
state, the specific form of intensity-dependent tripartite coupling, and system
parameters. The extent of nonclassicality of the field is assessed through the
Mandel Q parameter and Wigner function. Both entropic and quadrature squeezing
properties of the field are quantified directly from optical tomograms, thereby
avoiding tedious state reconstruction procedures.

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The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc