Generation of maximally entangled states of qudits using twin photons
  We report an experiment to generate maximally entangled states of D-dimensional quantum systems, qudits, by using transverse spatial correlations of two parametric down-converted photons. Apertures with D-slits in the arms of the twin fotons define the qudit space. By manipulating the pump beam correctly the twin photons will pass only by symmetrically opposite slits, generating entangled states between these differents paths. Experimental results for qudits with D=4 and D=8 are shown. We demonstrate that the generated states are entangled states. 
Leonardo Neves (1), G. Lima (1), J. G. Aguirre G\'omez (1 and 2), C.   H. Monken (1), C. Saavedra (2) and S. P\'adua (1) ((1...