Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Maximal Atom-Photon Entanglement in a Double-Lambda Quantum System   The atom-photon entanglement of dressed atom and its spontaneous emission in
a Double-Lambda closed-loop atomic system is studied in multi-photon resonance
condition. It is shown that, even in the absence of quantum interference due to
the spontaneous emission, the von Neumann entropy is phase-sensitive and it can
be controlled by either intensity or relative phase of the applied fields. It
is demonstrated that, for the special case of Rabi frequency of the applied
fields the system is maximally entangled. Moreover, the open-loop configuration
is considered and it is shown that the degree of entanglement measure (DEM) can
be controlled by intensity of the applied fields. Furthermore, in
electromagnetically induced transparency condition, the system is disentangled.
Such a system can be used for quantum information processing via entanglement
using optical switching.

10
The categories of this paper are: q-bio
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
18
The categories of this paper are: econ