Abstract
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.
- Received 27 December 1994
DOI:https://doi.org/10.1103/PhysRevA.51.4400
©1995 American Physical Society
