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\bibitem{Zakka-Bajjani_etal2011} Zakka-Bajjani, E., Nguyen, F. {\~A}. {\textsection}ois, Lee, M., Vale, L. R., Simmonds, R. W., \& Aumentado, J. (2011). Quantum superposition of a single microwave photon in two different {\textquoteright}colour{\textquoteright} states. \textit{Nat. Phys.}, \textit{7}(8), 599--603.

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