Characterization of multiqubit pure-state entanglement
arXiv:quant-ph/0505166 · doi:10.1103/PhysRevA.73.034306
Abstract
A necessary and sufficient entanglement criterion based on variances of Mermin-Klyshko's Bell operators is proved for multiqubit pure states. Contrary to Bell's inequalities, entangled pure states strictly satisfy a quadratic inequality but product ones can attain the equality under some local unitary transformations, which can be obtained by solving a quadratic maximum problem. This presents a characterization of multiqubit pure-state entanglement.
3 pages
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