Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological phases in ring resonators: recent progress and future
  prospects   Topological photonics has emerged as a novel paradigm for the design of
electromagnetic systems from microwaves to nanophotonics. Studies to date have
largely focused on the demonstration of fundamental concepts, such as
non-reciprocity and waveguiding protected against fabrication disorder. Moving
forward, there is a pressing need to identify applications where topological
designs can lead to useful improvements in device performance. Here we review
applications of topological photonics to ring resonator-based systems,
including one- and two-dimensional resonator arrays, and dynamically-modulated
resonators. We evaluate potential applications such as quantum light
generation, disorder-robust delay lines, and optical isolation, as well as
future research directions and open problems that need to be addressed.

16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th