Robustness of multiparty nonlocality to local decoherence

Details Robustness of multiparty nonlocality to local decoherence Robustness of multiparty nonlocality to local decoherence

2006-08-30

arxiv.org/abs/quant-ph/0608236v1

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

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.

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