Exciton-polaritons in lattices: A non-linear photonic simulator. A. Amo and J. Bloch in C. R. Phys. 17:934 (2016).  What the paper says!?

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A review on polariton simulators.

The archetypical ingredients of a photonic simulator are: (i) an array of sites in which photons are trapped or can travel in a confined way (i.e. optical cavities or waveguides), and (ii) a controlled hopping amplitude between sites.