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Quantum walks have attracted significant attention due to the possibility to propagate and reshape large-scale photon entanglement based on the superposition of possible photon paths. Entangling photons brings the promise of secure communication and ultra-fast quantum computing. Another phenomenon called optical nonlinearity allows interaction between electro-magnetic waves through matter. Bringing the concepts of quantum walks and optical nonlinearity together, and integrating them on a chip, opens a way to efficiently generate entangled photons and tune the entanglement. In this talk we will show the first experiments and theoretical studies featuring such tunable integrated sources.
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Alexander S. Solntsev, Andrey Sukhorukov, "Quantum walks of photons on a non-linear chip
(Conference Presentation)," Proc. SPIE 9920, Active Photonic Materials VIII, 992010 (9 November 2016); https://doi.org/10.1117/12.2237427