Two-particle entanglement as a property of three-particle entangled states

Details Two-particle entanglement as a property of three-particle entangled states Two-particle entanglement as a property of three-particle entangled states

1999-05-27

arxiv.org/abs/quant-ph/9905095v1

Phys.Rev.A56:1733-1738,1997

Physics

Quantum Physics

REVTeX, 7 pages, no figures

Scientific paper

10.1103/PhysRevA.56.1733

In a recent article [Phys. Rev. A 54, 1793 (1996)] Krenn and Zeilinger investigated the conditional two-particle correlations for the subensemble of data obtained by selecting the results of the spin measurements by two observers 1 and 2 with respect to the result found in the corresponding measurement by a third observer. In this paper we write out explicitly the condition required in order for the selected results of observers 1 and 2 to violate Bell's inequality for general measurement directions. It is shown that there are infinitely many sets of directions giving the maximum level of violation. Further, we extend the analysis by the authors to the class of triorthogonal states |Psi> = c_1 |z_1>|z_2>|z_3> + c_2 |-z_1>|-z_2>|-z_3>. It is found that a maximal violation of Bell's inequality occurs provided the corresponding three-particle state yields a direct ("all or nothing") nonlocality contradiction.

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