Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: In situ control of integrated Kerr nonlinearity   Kerr nonlinearity in nanophotonic cavities provides a versatile platform to
explore fundamental physical sciences and develop novel photonic technologies.
This is driven by the precise dispersion control and significant field
enhancement with nanoscale structures. Beyond dispersion and pump engineering,
the direct control of Kerr nonlinearity can release the ultimate performance
and functionality of photonic systems. Here, we report the in situ control of
integrated Kerr nonlinearity through its interplay with the cascaded Pockels
nonlinear process. Kerr nonlinearity is tuned over 10~dB dynamic range without
modifying photonic structures. Fano resonance is observed with nonlinear
spectrum, in contrast to standard linear transmission. This confirms the
quantum interference between competing optical nonlinear pathways. Besides
nonlinearity enhancement, we also demonstrate the novel capability to suppress
the material intrinsic nonlinearity. Finally, we use the tunable nonlinearity
to control the spectral brightness and coincidence-to-accidental ratio of
single-photon generation. This work paves the way towards the complete
nanoscale control of optical nonlinear processes at quantum level.

18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph