  Pure entangled states of two spatial qudits have been produced by using the
momentum transverse correlation of the parametric down-converted photons [Phys.
Rev. Lett. \textbf{94} 100501]. Here we show a generalization of this process
to enable the creation of mixed states of spatial qudits and by using the
technique proposed we generate mixed states of spatial qubits. We also report
how the process of quantum tomography is experimentally implemented to
characterize these states. This tomographic reconstruction is based on the free
evolution of spatial qubits, coincidence detection and a filtering process. The
reconstruction method can be generalized for the case of two spatial qudits.
