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Transfer of information between topological edge states is a robust way ofspatially manipulating quantum states while preserving their coherence inlattice environments. This method is particularly efficient when the edge modesare kept within the topological gap of the lattice during the transfer. In thiswork we show experimentally the transfer of photonic modes between topologicaledge states located at opposite ends of a dimerized one-dimensional photoniclattice. We use a diamond lattice of coupled waveguides and show that thetransfer is insensitive both to the presence of a high density of states in theform of a flat band at an energy close to that of the edge states, and to thepresence of disorder in the hoppings. We explore dynamics in the waveguidelattice using wavelength-scan method, where different input wavelengthtranslates into different effective waveguide length. These results open theway to the implementation of more efficient protocols based on the activedriving of the hoppings.

Spectral edge-to-edge topological state transfer in diamond photonic lattices