Biphoton light generation in polarization-frequency bell states
A. V. Burlakov, S. P. Kulik, Georgy O. Rytikov, Maria V. Chekhova · Journal of Experimental and Theoretical Physics · 2002
Four polarization-frequency Bell states are obtained experimentally for photon pairs (biphotons) emitted during spontaneous parametric scattering from continuous pumping in the collinear frequency-nondegenerate regime. The polarization properties of such states are investigated. It is shown that biphoton light in the singlet Bell state is not polarized in the second or fourth order in the field.