SCHEME FOR QUANTUM CLONING OF AN UNKNOWN N-PARTICLE ENTANGLED STATE WITH ASSISTANCE
PENG-CHENG MA, You-Bang Zhan · International Journal of Quantum Information · 2008
In this paper, we present a scheme which can realize quantum cloning of an unknown N-particle entangled state and its orthogonal complement state with assistance offered by a state preparer. The first stage of the scheme requires usual teleportation via N non-maximally entangled particle pairs as quantum channel. In the second stage of the scheme, with the assistance (through a N-particle projective measurement) of the preparer, the perfect copies and complement copies of an unknown N-particle entangled state can be obtained.