Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Effect of entanglement on the decay dynamics of a pair of
  H(2p) atoms due to spontaneous emission"   Tanabe et al (Phys. Rev. A {\bf 82} 040101(R) 2010) have experimentally
demonstrated that the emission properties of unstable atoms in entangled and
product states are different. The authors define an apparent decay time as a
fitting parameter which falls below the lifetime of the single atom for
entangled pairs. We argue that their results about coincidence time spectra are
correct, but those concerning lifetimes cannot be considered conclusive because
they assume the emission of photons by the two atoms to be independent
processes, a doubtful hypothesis for entangled states. We suggest an improved
evaluation of the lifetimes based on a rigorous approach, which demands some
modifications of the experimental procedure.

27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
19
The categories of this paper are: eess
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn