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A single linear optical set-up is used to observe an entire family of four-photon entangled states. This approach breaks with the inflexibility of present linear-optical set-ups usually designed for the observation of a particular multi-partite entangled state only. The family includes several prominent entangled states that are known to be highly relevant for quantum information applications.doi:10.1103/physrevlett.101.010503 pmid:18764097 fatcat:ogar2poj6fbfxbfalaqwszekge