Contextual, Optimal, and Universal Realization of the Quantum Cloning Machine and of the NOT Gate

2003/12/15 by F. De Martini, Francesco De Martini, Daniele Pelliccia +1 · 6 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph

paper · pdf · doi:10.1103/physrevlett.92.067901

published as Phys. Rev. Lett. 92, 067901 (2004) · 10 pages, 2 figures

arxiv created 2003/12/15 · openalex publication_date 2004/02/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

A simultaneous realization of the universal optimal quantum cloning machine and of the universal-NOT gate by a quantum injected optical parametric amplification, is reported. The two processes, forbidden in their exact form for fundamental quantum limitations, are found universal and optimal, and the measured fidelity F<1 is found close to the limit values evaluated by quantum theory. This work may enlighten the yet little explored interconnections of fundamental axiomatic properties within the deep structure of quantum mechanics.

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• Experimental asymmetric phase-covariant quantum cloning of polarization qubits
• Realization of an Optimally Distinguishable Multiphoton Quantum Superposition
• Phase-Sensitive Manipulations of a Squeezed Vacuum Field in an Optical Parametric Amplifier inside an Optical Cavity
• Separating the Classical and Quantum Information via Quantum Cloning
• Implementation of optimal phase-covariant cloning machines