  We experimentally observe a coexisting pair of topological anomalous Floquet
interface states in a (1+1)-dimensional Discrete Photon Walk. We explicitly
verify the robustness of these states against local static perturbations
respecting chiral symmetry of the system, as well as their vulnerability
against non-stationary perturbations. The walk is implemented based on pulses
propagating in a pair of coupled fibre loops of dissimilar lengths with
dynamically variable mutual coupling. The topological interface is created via
phase modulation in one of the loops, which allows for an anomalous Floquet
topological transition at the interface.
