Eric G. Brown, Eric J. Webster, Eduardo Martin-Martinez, Achim Kempf
We study the relationship between bipartite quantum discord in absence of entanglement and tripartite entanglement in the purified system. For qubits, we find that quantum discord requires the presence of both bipartite and genuinely tripartite quantum entanglement in the purified system. We consider generalizations of this result which then also allow us to explore the link between entanglement, discord and classical correlations in Gaussian states. Finally, we devise a protocol to remotely control the quantum discord resources available in a bipartite system AB.
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http://arxiv.org/abs/1212.3275
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