Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-color narrowband photon pair source with high brightness based on
  clustering in a monolithic waveguide resonator   We report on an integrated non-degenerate narrowband photon pair source
produced at 890 nm and 1320nm via type II parametric down-conversion in a
periodically poled waveguide with high-reflective dielectric mirrors deposited
on the waveguide end faces. The conversion spectrum consists of three clusters
and only 3 to 4 longitudinal modes with about 150 MHz bandwidth in each
cluster. The high conversion efficiency in the waveguide, together with the
spectral clustering in the double resonator, leads to a high brightness of
$3\times10^3~$pairs/(s$\cdot$mW$\cdot$MHz). The compact and rugged monolithic
design makes the source a versatile device for various applications in quantum
communication.

30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat