Abstract
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.
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Zhao, H., Zhang, X., Fei, S. et al. Characterization of four-qubit states via Bell inequalities. Chin. Sci. Bull. 58, 2334–2339 (2013). https://doi.org/10.1007/s11434-013-5884-1
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DOI: https://doi.org/10.1007/s11434-013-5884-1