Characterization of multiqubit pure-state entanglement

Details Characterization of multiqubit pure-state entanglement Characterization of multiqubit pure-state entanglement

2005-05-23

arxiv.org/abs/quant-ph/0505166v2

PHYSICAL REVIEW A 73, 034306(2006)

Physics

Quantum Physics

3 pages

Scientific paper

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.

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