Quadratic Bell inequalities as tests for multipartite entanglement
arXiv:quant-ph/0201070 · doi:10.1103/PhysRevLett.88.230406
Abstract
This letter presents quantum mechanical inequalities which distinguish, for systems of spin-$\half$ particles (), between fully entangled states and states in which at most particles are entangled. These inequalities are stronger than those obtained by Gisin and Bechmann-Pasquinucci [Phys.\ Lett. A {\bf 246}, 1 (1998)] and by Seevinck and Svetlichny [quant-ph/0201046].
4 pages, including 1 figure. Typo's removed and one proof simplified in revised version
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