Experimental realizations of the 1 -> M universal cloning machine
We report the first experimental realizations of the 1 -> M universal cloning machine. Two approaches are carefully described: the adoption of a state symmetrization linear optical procedure and of the quantum injected optical parametric amplifier. Furthermore, this device is adopted to generate optimally distinguishable multi-photon quantum superposition states.
universal cloning optical parametric amplifier linear optical symmetrization