  We report the successful generation of an entangled multiparticle quantum
superposition of pure photon states. They result from a multiple (universal}
cloning of a single photon qubit by a high gain, quantum-injected parametric
amplifier. The information preserving property of the process suggests for
these states the name of ''multi-particle qubits''. They are ideal objects for
investigating the emergence of the classical world in quantum systems with
increasing complexity, the decoherence processes and may allow the practical
implementation of the universal 2-qubit logic gates.
