Bell’s inequalities and quantum field theory. II. Bell’s inequalities are maximally violated in the vacuum

Abstract

In the context of the study of Bell’s inequalities carried out in Paper I [J. Math. Phys. 28, 2440 (1987)], it is proven that Bell’s inequalities are maximally violated in the vacuum state by suitable spacelike separated observables for both Bose and Fermi free quantum field theories.