Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectrally engineered broadband photon source for two-photon quantum
  interferometry   We present a new approach to engineering broadband sources of entangled
photon pairs for quantum interferometry. The source is based on
quasi-phase-matched spontaneous parametric down conversion in a titanium
diffused periodically poled lithium niobate waveguide with a strongly-chirped
poling period. The proposed non-standard asymmetric poling mitigates phase
distortions associated with the process of chirping. Asymmetric poling
significantly broadens the entangled source bandwidth while preserving high
visibility quantum interferometric sensing.

29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
2
The categories of this paper are: math
10
The categories of this paper are: q-bio