Robustness of multiparty nonlocality to local decoherence

We investigate the robustness of multiparty nonlocality under local decoherence, acting independently and equally on each subsystems. To be specific, we consider an N-qubit GHZ state under depolarization, dephasing, or dissipation channel, and tested the nonlocality by violation of Mermin-Klyshko in...

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Bibliographic Details
Published in:arXiv.org 2006-08
Main Authors: Jang, Sung Soon, Cheong, Yong Wook, Kim, Jaewan, Lee, Hai-Woong
Format: Article
Language:English
Subjects:
Depolarization
Robustness
Subsystems
Online Access:Get full text
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Summary:We investigate the robustness of multiparty nonlocality under local decoherence, acting independently and equally on each subsystems. To be specific, we consider an N-qubit GHZ state under depolarization, dephasing, or dissipation channel, and tested the nonlocality by violation of Mermin-Klyshko inequality, which is one of Bell's inequalities for multi-qubit 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.
ISSN:2331-8422
DOI:10.48550/arxiv.0608236