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\bibitem{Yao_etal2012} Yao, X. - C., Wang, T. - X., Xu, P., Lu, H., Pan, G. - S., Bao, X. - H., et al. (2012). Observation of eight-photon entanglement. \textit{Nat. Photon.}, \textit{6}(4), 225--228.

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