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Entanglement shared among multiple parties presents complex challenges forthe characterisation of different types of entanglement. One of the mostfundamental insights is the fact that some mixed states can featureentanglement across every possible cut of a multipartite system yet can beproduced via a mixture of states separable with respect to differentpartitions. To distinguish states that genuinely cannot be produced from mixingsuch partition-separable states, the term genuine multipartite entanglement wascoined. All these considerations originate in a paradigm where only a singlecopy of the state is distributed and locally acted upon. In contrast, advancesin quantum technologies prompt the question of how this picture changes whenmultiple copies of the same state become locally accessible. Here we show thatmultiple copies unlock genuine multipartite entanglement from partiallyseparable states, i.e., mixtures of the partition-separable states, even fromundistillable ensembles, and even more than two copies can be required toobserve this effect. With these findings, we characterise the notion of genuinemultipartite entanglement in the paradigm of multiple copies and conjecture astrict hierarchy of activatable states and an asymptotic collapse of thehierarchy.

Activation of genuine multipartite entanglement: Beyond the single-copy paradigm of entanglement characterisation