Realization of the optimal universal quantum entangler
Fabio Sciarrino, F. De Martini, Vladimír Bužek · Physical Review A · 2004
We present an experimental demonstration of the ``optimal'' and ``universal'' quantum entangling process involving qubits encoded in the polarization of single photons. The structure of the ``quantum entangling machine'' consists of the quantum injected optical parametric amplifier by which the simultaneous realization of the $1\ensuremath{\rightarrow}2$ universal quantum cloning and of the universal NOT (U-NOT) gate has also been achieved.