Improved implementation of nonclassicality test for a single particle
  Recently a test of nonclassicality for a single qubit was proposed [R. Alicki and N. Van Ryn, J. Phys. A: Math. Theor. 41, 062001 (2008)]. We present an optimized experimental realization of this test leading to a 46 standard deviation violation of classicality. This factor of 5 improvement over our previous result was achieved by moving from the infrared to the visible where we can take advantage of higher efficiency and lower noise photon detectors. 
Giorgio Brida, Ivo Pietro Degiovanni, Marco Genovese, Fabrizio   Piacentini, Valentina Schettini, Nicolas Gisin, Sergey V. P...