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<1 was found close to the limit values evaluated by quantum theory. A contextual theoretical and experimental investigation of these processes, which may represent the basic difference between the classical and the quantum worlds, can reveal in a unifying manner the detailed structure of quantum information. It may also enlighten the yet little explored interconnections of fundamental axiomatic properties within the deep structure of quantum mechanics.
Contextual realization of the universal quantum cloning machine and of the universal-NOT gate by quantum-injected optical parametric amplification / Pelliccia, D; Schettini, V; Sciarrino, F; Sias, Carlo; De Martini, F.. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 68:4(2003), p. 042306. [10.1103/PhysRevA.68.042306]
Contextual realization of the universal quantum cloning machine and of the universal-NOT gate by quantum-injected optical parametric amplification
SIAS, CARLO;
2003
Abstract
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<1 was found close to the limit values evaluated by quantum theory. A contextual theoretical and experimental investigation of these processes, which may represent the basic difference between the classical and the quantum worlds, can reveal in a unifying manner the detailed structure of quantum information. It may also enlighten the yet little explored interconnections of fundamental axiomatic properties within the deep structure of quantum mechanics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.