Simplified measurement of the Bell parameter within quantum mechanics
  We point out that, if one accepts the validity of quantum mechanics, the Bell parameter for the polarization state of two photons can be measured in a simpler way than by the standard procedure [Clauser, Horne, Shimony, and Holt, Phys. Rev. Lett. 23, 880 (1969)]. The proposed method requires only two measurements with parallel linear-polarizer settings for Alice and Bob at 0 and 45 degrees, and yields a significantly smaller statistical error for a large Bell parameter. 
Haruka Tanji (1 and 2), Jonathan Simon (1 and 2), Saikat Ghosh (1) and   Vladan Vuleti\'c (1) ((1) Department of Physics, MI...