Contextual realization of the universal quantum cloning machine and of the universal-NOT gate by quantum-injected optical parametric amplification

Daniele Pelliccia, V Schettini, F Sciarrino, C Sias, F De Martini

Research output: Contribution to journalArticleResearchpeer-review

48 Citations (Scopus)


A simultaneous, contextual experimental demonstration of the two processes of cloning an input qubit \Psi] and of flipping it into the orthogonal qubit \Psi] is reported. The adopted experimental apparatus, a quantum-injected optical parametric amplifier is transformed simultaneously into a universal optimal quantum cloning machine and into a universal-NOT quantum-information gate. The two processes, indeed forbidden in their exact form for fundamental quantum limitations, were found to be universal and optimal, i.e., the measured fidelity: of both processes F
Original languageEnglish
Pages (from-to)1 - 11
Number of pages11
JournalPhysical Review A
Issue number4
Publication statusPublished - 2003
Externally publishedYes

Cite this