Residual effect on the robustness of multiqubit entanglement
Residual effect on the robustness of multiqubit entanglement
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DOI：
10.1103/physreva.82.014301
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发表时间：
2010-07
影响因子：
2.9
通讯作者：
Bao-Kui Zhao;Fuguo Deng
中科院分区：
文献类型：
--
作者：
Bao-Kui Zhao;Fuguo Deng
研究了纠缠与多体系统对去极化噪声的鲁棒性之间的关系。我们发现，两量子比特系统在任意纯态下的鲁棒性完全依赖于它的纠缠。然而，在三量子比特系统中并不总是如此。在Greenberger-Horne-Zeilinger态和W态的任意叠加中，三量子比特系统的鲁棒性存在残余效应。它的纠缠性决定了其鲁棒性的发展趋势。然而，在相同的纠缠下，其鲁棒性存在分裂。它的鲁棒性不仅与其三角形具有相同的周期性，而且随三角形的变化而同步变化。对于n量子比特（n>3）系统的鲁棒性也存在分裂，尽管它更复杂。
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 a Greenberger-Horne-Zeilinger state and a 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.