Characterization of four-qubit states via Bell inequalities
Hui Zhao, Xing-Hua Zhang, Shao-Ming Fei, and Zhi-Xi Wang
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Submission date: 22. Feb. 2013
published in: Chinese science bulletin, 58 (2013) 19, p. 2334-2339
DOI number (of the published article): 10.1007/s11434-013-5884-1
PACS-Numbers: 03.67.Mn, 03.65.Ud
Keywords and phrases: Bell inequalities, separability, Bell operators
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A set of Bell inequalities classifying the quantum entanglement of four-qubit states is presented. These inequalities involve only two measurement settings per observer and can characterize fully separable, bi-separable and tri-separable quantum states. In addition, a quadratic inequality of the Bell operators for four-qubit systems is derived.