Robustness of multiqubit entanglement in the independent decoherence model
Robustness of multiqubit entanglement in the independent decoherence model
We study the robustness of the Greenberger-Horne-Zeilinger (``cat'') class of multipartite states under decoherence. The noise model is described by a general completely positive map for qubits independently coupled to the environment. In particular, the robustness of $N$-party entanglement is studied in the large $N$ limit when (a) the number …