Phys. Rev. A 61, 022119 (2000) [6 pages]Nonlocality without inequalities has not been proved for maximally entangled statesReceived 29 July 1999; published 18 January 2000 Two approaches to extend Hardy’s proof of nonlocality without inequalities to maximally entangled states of bipartite two-level systems are shown to fail. On one hand, it is shown that the proof of Wu and co-workers [Phys. Rev. A 53, R1927 (1996)] uses an effective state which is not maximally entangled. On the other hand, it is demonstrated that Hardy’s proof cannot be generalized by the replacement of one of the four von Neumann measurements involved in the original proof by a generalized measurement to unambiguously discriminate between nonorthogonal states. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.61.022119
DOI:
10.1103/PhysRevA.61.022119
PACS:
03.65.Bz
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