First experimental test of Bell inequalities performed using a   non-maximally entangled state
  We report on the realisation of a new test of Bell inequalities using the superposition of type I parametric down conversion produced in two different non-linear crystals pumped by the same laser, but with different polarisation. The produced state is non-maximally entangled. We discuss the advantages and the possible developments of this configuration. 
M.Genovese, G. Brida, C. Novero and E. Predazzi