Multipartite quantum nonlocality under local decoherence

摘要

We study the nonlocal properties of two-qubit maximally entangled and N-qubit Greenberger-Horne-Zeilingernstates under local decoherence. We show that the (non)resilience of entanglement under local depolarizationnor dephasing is not necessarily equivalent to the (non)resilience of Bell-inequality violations. Apart fromnentanglement and Bell-inequality violations, we consider also nonlocality as quantified by the nonlocalncontent of correlations and provide several examples of anomalous behaviors, both in the bipartite andnmultipartite cases. In addition, we study the practical implications of these anomalies on the usefulnessnof noisy Greenberger-Horne-Zeilinger states as resources for nonlocality-based physical protocols given byncommunication complexity problems.