Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entanglement, EPR correlations and mesoscopic quantum superposition by
  the high-gain quantum injected parametric amplification   We investigate the multiparticle quantum superposition and the persistence of
multipartite entanglement of the quantum superposition generated by the quantum
injected high-gain optical parametric amplification of a single photon. The
physical configuration based on the optimal universal quantum cloning has been
adopted to investigate how the entanglement and the quantum coherence of the
system persists for large values of the nonlinear parametric gain g.

11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ