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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
- 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