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Title: Quantum networks reveal quantum nonlocality.
Authors: Cavalcanti, D. 
Almeida, M.L.
Scarani, V.
Acín, A.
Issue Date: 2011
Citation: Cavalcanti, D., Almeida, M.L., Scarani, V., Acín, A. (2011). Quantum networks reveal quantum nonlocality.. Nature communications 2 : 184-. ScholarBank@NUS Repository.
Abstract: The results of local measurements on some composite quantum systems cannot be reproduced classically. This impossibility, known as quantum nonlocality, represents a milestone in the foundations of quantum theory. Quantum nonlocality is also a valuable resource for information-processing tasks, for example, quantum communication, quantum key distribution, quantum state estimation or randomness extraction. Still, deciding whether a quantum state is nonlocal remains a challenging problem. Here, we introduce a novel approach to this question: we study the nonlocal properties of quantum states when distributed and measured in networks. We show, using our framework, how any one-way entanglement distillable state leads to nonlocal correlations and prove that quantum nonlocality is a non-additive resource, which can be activated. There exist states, local at the single-copy level, that become nonlocal when taking several copies of them. Our results imply that the nonlocality of quantum states strongly depends on the measurement context.
Source Title: Nature communications
ISSN: 20411723
Appears in Collections:Staff Publications

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