  Transferring quantum states efficiently between distant nodes of an
information processing circuit is of paramount importance for scalable quantum
computing. We report on the first observation of a perfect state transfer
protocol on a lattice, thereby demonstrating the general concept of trans-
porting arbitrary quantum information with high fidelity. Coherent transfer
over 19 sites is realized by utilizing judiciously designed optical structures
consisting of evanescently coupled waveguide ele- ments. We provide unequivocal
evidence that such an approach is applicable in the quantum regime, for both
bosons and fermions, as well as in the classical limit. Our results illustrate
the potential of the perfect state transfer protocol as a promising route
towards integrated quantum computing on a chip.
