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\bibitem{Lu_etal2007} Lu, C. - Y., Zhou, X. - Q., G{\"u}hne, O., Gao, W. - B., Zhang, J., Yuan, Z. - S., et al. (2007). Experimental entanglement of six photons in graph states. \textit{Nat. Phys.}, \textit{3}(2), 91--95.

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