Strong violations of locality by testing Bell’s inequality with improved entangled-photon systems
Wang Yaoa), Fan Dai-Hea), Guo Wei-Jiea), Wei Lian-Fu†a),b)
       
Elements of the reconstructed density matrix ρ i : panel (a) is the image of the real part of the density matrix, and panel (b) is the image of the imaginary part of the density matrix.