Some further comments on the Selleri-Tarozzi proof of the nonlocality of quantum mechanics

Augusto Garuccio, J. R. Torgerson, Carlos Henrique Monken +2 more

Selleri's model of photodetection based on variable detection probability is analyzed. The results of an experiment that discriminates between the predictions of Selleri's model and quantum mechanics are presented [Bell's Theorem and the Foundations of Modern Physics, edited by A. van der Merwe, F. Selleri, and G. Tarozzi (World Scientific, Singapore, 1992); in Wave-Particle Duality, edited by F. Selleri (Plenum, New York, 1992)]. \textcopyright{} 1996 The American Physical Society.

William J. Lehr

William George Unruh

Stapp [preceding Comment, Phys. Rev. A 60, 2595 (1999)] has argued that my criticism of his nonlocality proof is wrong. I point out that counterfactual arguments are fraught with dangers, and that any such claim should use them in a conservative manner. A reanalysis of his claims continues to lead me to the conclusion that the nonlocality of quantum mechanics remains unproven.

Mariami Gachechiladze, Otfried Gühne

J. R. Torgerson, David A. Branning, Carlos Henrique Monken +1 more

Two-photon polarization-correlation measurements have been performed in order to test local realism under conditions in which the two photons pass through quarter-wave plates before reaching the polarizers. The motivation for this experiment is the fact that two previous experiments with quarter-wave plates preceding the polarizers failed to observe statistically significant violations of locality [J. F. Clauser, Nuovo Cimento 338, 740 (1976); A. J. Duncan, H. Kleinpoppen, and Z. A. Sheikh, in Bell's Theorem and the Foundations of Modern Physics, edited by A. van der Merwe, F. Selleri, and G. Tarozzi (World Scientific, Singapore, 1992), p. 161]. We find that the Clauser-Horne type of Bell inequality is violated by about 40 standard deviations. Possible reasons for the failure of earlier experiments are discussed.

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