1307.6656 (Hui Zhao et al.)

Characterization of four-qubit states via Bell inequalities    [PDF]

Hui Zhao, Xing-Hua Zhang, Shao-Ming Fei, Zhi-Xi Wang

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.

View original: http://arxiv.org/abs/1307.6656