Quadratic Bell inequalities as tests for multipartite entanglement

Details Quadratic Bell inequalities as tests for multipartite entanglement Quadratic Bell inequalities as tests for multipartite entanglement

2002-01-17

arxiv.org/abs/quant-ph/0201070v2

Physics

Quantum Physics

4 pages, including 1 figure. Typo's removed and one proof simplified in revised version

Scientific paper

10.1103/PhysRevLett.88.230406

This letter presents quantum mechanical inequalities which distinguish, for
systems of $N$ spin-$\half$ 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 {\bf 246}, 1 (1998)] and by Seevinck and Svetlichny [quant-ph/0201046].

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