Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonclassical Interference Effects In The Radiation From Coherently
  Driven Uncorrelated Atoms   We demonstrate the existence of new nonclassical correlations in the
radiation of two atoms, which are coherently driven by a continuous laser
source. The photon-photon-correlations of the fluorescence light show a spatial
interferene pattern not present in a classical treatment. A feature of the new
phenomenon is, that bunched and antibunched light is emitted in different
spatial directions. The calculations are performed analytically. It is pointed
out, that the correlations are induced by state reduction due to the
measurement process when the detection of the photons does not distinguish
between the atoms. It is interesting to note, that the phenomena show up even
without any interatomic interaction.

25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas