Comment on "Bell's Theorem without Inequalities and without Alignments"

Details Comment on "Bell's Theorem without Inequalities and without Alignments" Comment on "Bell's Theorem without Inequalities and without Alignments"

2004-09-20

arxiv.org/abs/quant-ph/0409129v1

Phys. Rev. Lett. 93, 128901 (2004)

Physics

Quantum Physics

1 page, RevTex

Scientific paper

10.1103/PhysRevLett.93.128901

In this Comment we show that Cabello's proof of Bell's theorem without inequalities [Phys. Rev. Lett. 91, 230403 (2003)] does not exhibit two of the three "remarkable properties" which the proof is claimed to possess. More precisely it is our purpose to show that property (c) of Cabello's proof, stating that ``local observables can be measured by means of tests on individual qubits" is definitely false since it has been obtained by a wrong use of the basic rules of the quantum formalism, while property (b), stating that ``distant local setups do not need to be aligned since the require perfect correlations are achieved for any local rotation of the setups", is also wrong due to the failure of validity of property (c).

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