  We address the performance of a coin-biased quantum walk as a generator for
non-classical position states of the walker. We exploit a phenomenon of
coherent localisation in the position space --- resulting from the choice of
small values of the coin parameter and assisted by post-selection --- to
engineer large-size coherent superpositions of distinguishable position states
of the walker. The protocol that we design appears to be remarkably robust
against both the actual value taken by the coin parameter and strong
dephasing-like noise acting on the spatial degree of freedom. We finally
illustrate a possible linear-optics implementation of our proposal, suitable
for both bulk and integrated-optics platforms.
