We demonstrate a coined quantum walk over ten steps in a one-dimensional network of linear optical elements. By applying single-point phase defects, the translational symmetry of an ideal standard quantum walk is broken resulting in localization effect in a quantum walk architecture. We furthermore investigate how the level of phase due to single-point phase defects and coin settings influence the strength of the localization signature.
@article{arxiv.1401.6109,
title = {Trapping photons on the line: controllable dynamics of a quantum walk},
author = {P. Xue and H. Qin and B. Tang},
journal= {arXiv preprint arXiv:1401.6109},
year = {2014}
}