Experimental Quantum Cloning with Prior Partial Information
Jiangfeng Du, Thomas Durt, Ping Zou, Hui Li, L. C. Kwek, Ching–Yi Lai, C. H. Oh, ARTUR K. EKERT · Physical Review Letters · 2005
When prior partial information about a state to be cloned is available, it can be cloned with a fidelity higher than that of universal quantum cloning. We experimentally verify this intriguing relationship between the cloning fidelity and the prior information by reporting the first experimental optimal quantum state-dependent cloner, using nuclear magnetic resonance techniques. Our experiments may further cast important implications into many quantum information processing protocols.