Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entangling one polariton with a photon: effect of interactions on a
  single-polariton quantum state   Polaritons are quasi-particles originating from the coupling of light with
matter that demonstrated quantum phenomena at the many-particle mesoscopic
level, such as BEC and superfluidity. A highly sought and long-time missing
feature of polaritons is a genuine quantum manifestation of their dynamics at
the single-particle level. Although they are conceptually perceived as
entangled states and theoretical proposals abound for an explicit manifestation
of their single-particle properties, so far their behaviour has remained fully
accountable for by classical and mean-field theories. In this Article, we
report the first experimental demonstration of a genuinely-quantum
manifestation of microcavity polaritons, by swapping, in a two-photon entangled
state generated by parametric down-conversion, a photon for a polariton.
Furthermore, we show how single polaritons are affected by polariton-polariton
interactions in a propaedeutic demonstration of their qualities for quantum
information applications.

14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph