Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Highly efficient generation of single-mode photon pairs using a
  crystalline whispering gallery mode resonator   We report a highly efficient source of narrow-band photon pairs based on
parametric down-conversion in a crystalline whispering gallery mode resonator.
Remarkably, each photon of a pair is strictly emitted into a single spatial and
temporal mode, as witnessed by Glaubers autocorrelation function. We explore
the phase-matching conditions in spherical geometries, and determine the
requirements of the single-mode operation. Understanding these conditions has
allowed us to experimentally demonstrate a single-mode pair-detection rate of
$0.97 \cdot 10^6$ pairs/s per mW pump power per 20 MHz bandwidth without the
need of additional filter cavities.

22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg