This Letter presents quantum mechanical inequalities which distinguish, for systems of n spin- 1/2 particles ( $n>2$), between fully entangled states and states in which at most n-1 particles are entangled. These inequalities are stronger than those obtained by Gisin and Bechmann-Pasquinucci [Phys. Lett. A 246, 1 (1998)] and by Seevinck and Svetlichny [quant-ph/0201046].
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Jos Uffink (2002) studied this question.
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