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I impose previously neglected symmetry conditions in Leggett's non-localhidden variable theory that are required by the conditions in a recentexperimental test of this theory. These conditions lead to an inequality forthe polarization correlation function that has a maximal violation from thequantum predictions that is 2.5 times larger than reported in this article.Furthermore, when these symmetry conditions are applicable, Leggett's non-localtheory also cannot model the observed quantum correlations in previousexperiments.

Violation of an inequality in an experimental test of Leggett's non-local hidden variable theory