Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photonic gauge potential in a system with a synthetic frequency
  dimension   We generalize the concept of photonic gauge potential in real space, by
introducing an additional "synthetic" frequency dimension in addition to the
real space dimensions. As an illustration we consider a one-dimensional array
of ring resonators, each supporting a set of resonant modes having a frequency
comb with spacing $\Omega$, undergoing a refractive index modulation at the
modulation frequency equal to $\Omega$. We show that the modulation phase
provides a gauge potential in the synthetic two-dimensional space with the
dimensions being the frequency and the spatial axes. Such gauge potential can
create a topologically protected one-way edge state in the synthetic space that
is useful for high-efficiency generation of higher-order side bands.

25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci