GHZ argument for four-qubit entangled states in the presence of white and colored noise |
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| Authors: | Ming-jun Shi Bo Chong Jiang-feng Du |
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| Affiliation: | a Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
b Hefei National Laboratory for Physical Sciences at Microscale, Hefei, Anhui 230026, China |
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| Abstract: | Greenberger-Horn-Zeilinger (GHZ) argument of nonlocality without inequalities is extended to the case of four-qubit mixed states. Three different kinds of entangled states are analyzed in presence of white and colored noise. The nonlocality properties of these states will be weakened and destroyed by the noise. We found that all these states have the same ability to resist the influence of white noise, while the cluster state is the most robust against colored noise. |
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| Keywords: | 03.65.Ud |
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