  Entangled pure-states, Werner-states and generalized mixed-states of any
structure, spanning a 2x2 Hilbert space are created by a novel high-brilliance
universal source of polarization-entangled photon pairs. The violation of a
Bell inequality has been tested for the first time with a pure-state, indeed a
conceptually relevant ideal condition, and with Werner-states. The generalized
''maximally entangled mixed states'' (MEMS) were also synthetized for the first
time and their exotic properties investigated by means of a quantum tomographic
technique.
