Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient generation of correlated photon pairs in a microstructure
  fiber   We report efficient generation of correlated photon pairs through degenerate
four-wave mixing in microstructure fibers. With 735.7 nm pump pulses producing
conjugate signal (688.5 nm) and idler (789.8 nm) photons in a 1.8 m
microstructure fiber, we detect photon pairs at a rate of 37.6 kHz with a
coincidence/accidental contrast of 10:1 with a full-width-at-half-maximum
bandwidth of 0.7 nm. This is the highest rate reported to date in a fiber-based
photon source. The nonclassicality of this source, as defined by the
Zou-Wang-Mandel inequality, is violated by 1100 times the uncertainty.

16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc