Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Production of heralded pure single photons from imperfect sources using
  cross phase modulation   Realistic single-photon sources do not generate single photons with
certainty. Instead they produce statistical mixtures of photons in Fock states
$\ket{1}$ and vacuum (noise). We describe how to eliminate the noise in the
output of the sources by means of another noisy source or a coherent state and
cross phase modulation (XPM). We present a scheme which announces the
production of pure single photons and thus eliminates the vacuum contribution.
This is done by verifying a XPM related phase shift with a Mach-Zehnder
interferometer.

22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th