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|Title:||Quantum networks reveal quantum nonlocality.|
|Authors:||Cavalcanti, D. |
|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|
|Appears in Collections:||Staff Publications|
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