Residual effect on the robustness of multiqubit entanglement release_mxmsitnco5dulcity4l623zyci

by Bao-Kui Zhao, Fu-Guo Deng

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2010  

Abstract

We investigate the relation between the entanglement and the robustness of a multipartite system to a depolarization noise. We find that the robustness of a two-qubit system in an arbitrary pure state depends completely on its entanglement. However, this is not always true in a three-qubit system. There is a residual effect on the robustness of a three-qubit system in an arbitrary superposition of Greenberger-Horne-Zeilinger state and W state. Its entanglement determines the trend of its robustness. However, there is a splitting on its robustness under the same entanglement. Its robustness not only has the same periodicity as its three-tangle but also alters with its three-tangle synchronously. There is also a splitting on the robustness of an n-qubit (n>3) system although it is more complicated.
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Date   2010-07-01
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arXiv  1007.0068v1
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