Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral characterization of weak coherent state sources based on
  two-photon interference   We demonstrate a method for characterizing the coherence function of coherent
states based on two-photon interference. Two states from frequency mismatched
faint laser sources are fed into a Hong-Ou-Mandel interferometer and the
interference pattern is fitted with the presented theoretical model for the
quantum beat. The fitting parameters are compared to the classical optical beat
when bright versions of the sources are used. The results show the equivalence
between both techniques.

30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys