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Title: Quantum nonlocality of four-qubit entangled states
Authors: Wu, C. 
Yeo, Y. 
Kwek, L.C. 
Oh, C.H. 
Issue Date: 26-Mar-2007
Citation: Wu, C., Yeo, Y., Kwek, L.C., Oh, C.H. (2007-03-26). Quantum nonlocality of four-qubit entangled states. Physical Review A - Atomic, Molecular, and Optical Physics 75 (3) : -. ScholarBank@NUS Repository.
Abstract: 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 | χ that has recently been proposed in. The Bell inequality is optimally violated by | χ but not violated by the GHZ state. The linear cluster state also violates the Bell inequality though not optimally. The state | χ can thus be discriminated from the linear 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. © 2007 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
ISSN: 10502947
DOI: 10.1103/PhysRevA.75.032332
Appears in Collections:Staff Publications

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