  We introduce a simple method to realize and detect photonic topological Chern
insulators with one-dimensional circiut quantum electrodynamics arrays. By
periodically modulating the couplings of the array, we show that this
one-dimensional model can be mapped into a two-dimensional Chern insulator
model. In addition to allowing the study of photonic Chern insulators, this
approach also provides a natural platform to realise experimentally Laughlin's
pumping argument. Based on scattering theory of topological insulators and
input-output formalism, we show that the photonic edge state can be probed
directly and the topological invariant can be detected from the winding number
of the reflection coefficient phase.
