Robustness of multiparty nonlocality to local decoherence

Abstract

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.

5 pages, 4 figures

References in corpus (2)

• Robustness of multi-qubit entanglement in the independent decoherence model
• On Series of Multiqubit Bell's Inequalities

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• Entanglement and communication-reducing properties of noisy N-qubit states
• Adiabatic Creation of Atomic Squeezing in Dark States vs. Decoherences
• Dephasing of entangled atoms as an improved test of quantum gravity