Quantum nonlocality of four-qubit entangled states

@article{Wu2007QuantumNO,
title={Quantum nonlocality of four-qubit entangled states},
author={Chunfeng Wu and Y. Yeo and L. C. Kwek and C. H. Oh},
journal={Physical Review A},
year={2007},
volume={75},
pages={032332}
}

We derive a Bell inequality for testing violation of local realism. Quantum nonlocality of several four-qubit states is investigated. These include the Greenberger-Zeilinger-Horne (GHZ) state, W state, linear cluster state, and the state |{chi}> that has recently been proposed in [Phys. Rev. Lett. 96, 060502 (2006)]. The Bell inequality is optimally violated by |{chi}> but not violated by the GHZ state. The linear cluster state also violates the Bell inequality though not optimally. The state… CONTINUE READING