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Paper detail

Certifying nonlocality from separable marginals

Imagine three parties, Alice, Bob, and Charlie, who share a state of three qubits such that all two-party reduced states A-B,A-C, and B-C are separable. Suppose that they have information only about these marginals but not about the global state. According to recent results, there exists an example for a set of three separable two-party reduced states that is only compatible with an entangled global state. In this paper, we show a stronger result, by exhibiting separable two-party reduced states A-B, A-C, and B-C, such that any global state compatible with these marginals is nonlocal. Hence, we obtain that nonlocality of multipartite states can be certified from information only about separable marginals.

preprint2014arXivOpen access
Tamas VertesiWieslaw LaskowskiKaroly F. Pal
quant-ph
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Tamas VertesiWieslaw LaskowskiKaroly F. Pal

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