Anderson localization can be understood as interference phenomena between multiple scattering paths. The dynamics of the composite particle is, however, affected by couplings to internal states that provide which-way information, that may suppress quantum interferences thus affecting localization in the spatial dimension. We illustrate that the coupling has a dramatic effect on localization properties, even with a small number of internal states participating in quantum dynamics. The model can be applied to quantum walk and Anderson localization of photons with orbital angular momentum.
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Speaker: Fumika Suzuki (IST Austria)