Quantum nonlocality of four-qubit entangled states
Abstract
Quantum nonlocality of several four-qubit states is investigated by constructing a new Bell inequality. These include the Greenberger-Zeilinger-Horne (GHZ) state, W state, cluster state, and the state that has been recently proposed in [PRL, {\bf 96}, 060502 (2006)]. The Bell inequality is optimally violated by but not violated by the GHZ state. The cluster state also violates the Bell inequality though not optimally. The state can thus be discriminated from the cluster state by using the inequality. Different aspects of four-partite entanglement are also studied by considering the usefulness of a family of four-qubit mixed states as resources for two-qubit teleportation. Our results generalize those in [PRL, {\bf 72}, 797 (1994)].
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Cite
@article{arxiv.quant-ph/0611172,
title = {Quantum nonlocality of four-qubit entangled states},
author = {Chunfeng Wu and Ye Yeo and L. C. Kwek and C. H. Oh},
journal= {arXiv preprint arXiv:quant-ph/0611172},
year = {2013}
}
Comments
13 pages, 1 figure