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Two Copies of Biseparable States Achieve Genuine Multipartite Entanglement

Scientists have unveiled a protocol that activates genuine multipartite entanglement (GME) using only two copies of biseparable states, a stark improvement over earlier multi‑copy requirements. The method distills bipartite entangled pairs from each copy and recombines them to form a pure multipartite state, without needing joint measurements across copies. It scales to an arbitrary number of parties, and the resulting states also exhibit genuine nonlocal correlations. Experiments on three‑qutrit systems demonstrate non‑zero success probability, highlighting practical feasibility.