Polarization entangled source

Pairs of orthogonally polarized photons will be generated in two different periodically poled waveguides on LiNbO3 PPLN wafers and subsequently split on an integrated polarizing beam splitter PBS such that the photons of each pair emege on two different spatial modes with orthogonal polarizations The superposition of the states generated by the two different sources results in the desired entangled state In this scheme the quality of the entanglement depends on both the homogeneity of the two poled waveguides and the splitting ratio of the integrated polarizing beam splitter The combination of these characteristics with the high brightness of our PPLN waveguides which reaches values of about 15 photons per microW at 1 MHz repetition rate will result in a source of polarization entangled states whose brightness is 2 orders of magnitude higher than the available bulk sources