Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement in Weisskopf-Wigner theory of atomic decay in free space   In this paper, we use the Weisskopf-Wigner theory to study the entanglement
in the state of the free-space radiation field produced from vacuum due to
atomic decay. We show how bipartite entanglement is shared between different
partitions of the radiation modes. We investigate the role played by the size
of the partitions and their detuning with the decaying atom. The dynamics of
the atom-field entanglement during the atomic decay is also briefly discussed.
  From this dynamics, we assert that such entanglement is the physical quantity
that fix the statistical atomic decay time.

21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
3
The categories of this paper are: physics