Integrated optics provides an ideal test bed for the emulation of quantum systems via continuous-time quantum walks. Here we study the evolution of two-photon states in an elliptic array of waveguides. We characterise the photonic chip via coherent-light tomography and use the results to predict distinct differences between temporally indistinguishable and distinguishable two-photon inputs which we then compare with experimental observations. Our work highlights the feasibility for emulation of coherent quantum phenomena in three-dimensional waveguide structures.
@article{arxiv.1103.0604,
title = {Two-photon quantum walks in an elliptical direct-write waveguide array},
author = {J. O. Owens and M. A. Broome and D. N. Biggerstaff and M. E. Goggin and A. Fedrizzi and T. Linjordet and M. Ams and G. D. Marshall and J. Twamley and M. J. Withford and A. G. White},
journal= {arXiv preprint arXiv:1103.0604},
year = {2012}
}