  Quantum random walks (QRWs) are random processes in which the resulting
probability density of the "walker" state, whose movement is governed by a
"coin" state, is described in a non-classical manner. Previously, Q-plates have
been used to demonstrate QRWs with polarization and orbital angular momentum
playing the role of coin and walker states, respectively. In this theoretical
analysis, we show how stress-engineered optics can be used to develop new
platforms for complex QRWs through relative simple optical elements. Our work
opens up new paths to speed up classical-to-quantum transitions in robust
photonic networks.
