Multiparticle entanglement as an emergent phenomenon Article Swipe
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· 2016
· Open Access
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· DOI: https://doi.org/10.1103/physreva.93.020104
· OA: W2593344530
The question whether global entanglement of a multiparticle quantum system\ncan be inferred from local properties is of great relevance for the theory of\nquantum correlations as well as for experimental implementations. We present a\nmethod to systematically find quantum states, for which the two- or three-body\nmarginals do not contain any entanglement, nevertheless, the knowledge of these\nreduced states is sufficient to prove genuine multiparticle entanglement of the\nglobal state. With this, we show that the emergence of global entanglement from\nseparable local quantum states occurs frequently and for an arbitrary number of\nparticles. We discuss various extensions of the phenomenon and present examples\nwhere global entanglement can be proven from marginals, even if entanglement\ncannot be localized in the marginals with measurements on the other parties.\n
