Quantum simulations and quantum walks

poster: Quantum walks in waveguide-arrays with quadratic nonlinearities

speaker: Craig Hamilton (Czech Technical University )

abstract: Present day technology allows us to manufacture coupled waveguide-arrays that include a nonlinear down-conversion process. In these devices down-converted light evanescently couples to nearest-neighbour waveguides, a process which is different from previous work where the light is injected into a linear network. We interpret this new process in terms of a more traditional quantum walk, as here the 'walkers' are created throughout the walk, and describe the propagation of light in these devices. We highlight the spatial and spectral correlations of the light in the waveguides, how this depends upon the experimental parameters and finish by exploring possible applications of these devices.

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