Abstract
Imagine three parties, Alice, Bob, and Charlie, who share a state of three qubits such that all two-party reduced states -, -, and - 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 -, -, and -, 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.
- Received 6 November 2013
DOI:https://doi.org/10.1103/PhysRevA.89.012115
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