1996/12/31 by Sandu Popescu, Lucien Hardy, Lucién Hardy +2 · 1 citation
Arts and Humanities · Computer Science · Physics and Astronomy · #Philosophy and History of Science #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph
paper · pdf · doi:10.1103/physreva.56.r4353
Contains some new material. LaTeX, 11 pages, 1 fig; The figure is not encapsulated, please print it separately
arxiv created 1997/06/25 · openalex publication_date 1997/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A certain class of parametric down-conversion Bell-type experiments has the following features. In the idealized perfect situation it is in only 50% of the cases that each observer receives a photon; in the other 50% one observer receives both photons of a pair while the other observer receives none. The standard approach is to discard the events of the second type. Only the remaining ones are used as the data input to some Bell inequalities. This raises justified doubts about whether such experiments could ever be genuine tests of local realism. We propose to take into account these ``unfavorable'' cases and to analyze the entire pattern of polarization and localization correlations. This departure from the standard reasoning enables one to show that the experiments are indeed a true test of local realism.