Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement in a Jaynes-Cummings Model with Two Atoms and Two Photon
  Modes   We investigate the conditions of entanglement for a system of two atoms and
two photon modes in vacuum, using the Jaynes-Cummings model in the
rotating-wave approximation. It is found, by generalizing the existing results,
that the strength of entanglement is a periodic function of time. We explicitly
show that our results are in agreement with the existing results of
entanglement conditions under appropriate limits. Results for the two-atom and
two-photon system are generalized to the case of arbitrary values for the
atomic energies, corresponding to photon modes frequencies. Though it is
apparently a generalization of the existing work, we have considered for the
first time both the resonant and nonresonant conditions and found a general
equation which could be true for both cases. Moreover, we show that periodicity
of the entanglement is a distinct feature of resonant system. Considering the
two atoms and two photons system, in detail, we setup an approach which could
be generalized for many particle systems and the resulting master equation can
also be analyzed.

11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph