  We use simple deterministic dynamical systems as coins in studying quantum
walks. These dynamical systems can be chosen to display, in the classical
limit, a range of behaviors from the integrable to chaotic, or
deterministically random. As an example of an integrable coin we study the
Fourier walk that generalizes the Hadamard walk and show that the walker slows
down with coin dimensionality, which controls the effective Planck constant.
Introducing multi-Harper maps as deterministic models of random walks we study
the effect of coin chaos on the quantum walk. We also demonstrate that breaking
time-reversal symmetry in the coin dynamics effectively slows down the walk.
