Useful multipartite correlations from useless reduced states

Details Useful multipartite correlations from useless reduced states Useful multipartite correlations from useless reduced states

2012-03-22

arxiv.org/abs/1203.4968v1

Physics

Quantum Physics

Scientific paper

Understanding what can be inferred about a multi-particle quantum system from only the knowledge of its subparts is a highly non-trivial task. Clearly, if the global system doesn't contain any information resource, nor do its subparts. However, is the converse also true? We show that the answer to is negative. We provide three two-qubit states that are non-entangled, but such that any three-qubit state compatible with them is entangled. Entanglement can thus be deduced from the mere observation of separable reduced states. We extend this finding to correlations and provide local marginal correlations that are only compatible with global genuinely tripartite non-local correlations.

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