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Journal Article Robustness of Multiparty Nonlocality to Local Decoherence
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Authors
Sung Soon Jang, Yong Wook Cheong, Jae Wan Kim, Hai Woong Lee
Issue Date
2006-08
Citation
Physical Review A : Atomic, Molecular, and Optical Physics, v.74, no.6, pp.1-5
ISSN
1050-2947
Publisher
American Physical Society(APS)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1103/PhysRevA.74.062112
Abstract
We investigate the robustness of multiparty nonlocality under local decoherence, acting independently and equally on each subsystem. To be specific, we consider an N -qubit Greenberger-Horne-Zeilinger (GHZ) state under a depolarization, dephasing, or dissipation channel, and examine nonlocality by testing violation of the Mermin-Klyshko inequality, which is one of Bell's inequalities for multiqubit systems. The results show that the robustness of nonlocality increases with the number of qubits, and that the nonlocality of an N -qubit GHZ state with even N is extremely persistent against dephasing. © 2006 The American Physical Society.
KSP Keywords
Bell's inequality, GHZ state