Multiphoton nonclassical correlations in entangled squeezed vacuum states
Bhaskar Kanseri, T. Sh. Iskhakov, Georgy O. Rytikov, Maria V. Chekhova, Gerd Leuchs · Physical Review A · 2013
Photon-number correlation measurements are performed on bright squeezed vacuum states using a standard Bell-test setup, and quantum correlations are observed for conjugate polarization-frequency modes. We further test the entanglement witnesses for these states and demonstrate the violation of the separability criteria, which infers that all of the macroscopic Bell states, containing typically ${10}^{6}$ photons per pulse, are polarization entangled. The study also reveals the symmetry of macroscopic Bell states with respect to local polarization transformations.