Directionally tunable co- and counterpropagating photon pairs from a nonlinear metasurface by Weissflog Maximilian A., Ma Jinyong, Zhang Jihua, Fan Tongmiao, Lung Shaun, Pertsch Thomas, Neshev Dragomir N., Saravi Sina, Setzpfandt Frank, Sukhorukov Andrey A.

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