Measurement of the degree of polarization entanglement through position interference - art. no. 023804

We produce polarization entangled states with variable degree of entangleme nt for twin photons. Entanglement in polarization is coupled to entanglemen t in position that produces transverse coincidence interference fringes. We show both theoretically and experimentally that we can use the position in terference pattern to measure the polarization degree of entanglement. The coupling between polarization and transverse degrees of freedom are demonst rated to be useful in the manipulation of the entanglement of the twin phot ons.