The optimal phase-covariant quantum cloning machine (PQCM) broadcasts the information associated to an input qubit into a multiqubit system, exploiting a partial a priori knowledge of the input state. This additional a priori information leads to a higher fidelity than for the universal cloning. The present article first analyzes different innovative schemes to implement the 1 -> 3 PQCM. The method is then generalized to any 1 -> M machine for an odd value of M by a theoretical approach based on the general angular momentum formalism. Finally different experimental schemes based either on linear or nonlinear methods and valid for single photon polarization encoded qubits are discussed.

Implementation of optimal phase-covariant cloning machines / Sciarrino, Fabio; DE MARTINI, Francesco. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 76:1(2007), pp. 012330-1-012330-6. [10.1103/physreva.76.012330]

Implementation of optimal phase-covariant cloning machines

SCIARRINO, Fabio;DE MARTINI, Francesco
2007

Abstract

The optimal phase-covariant quantum cloning machine (PQCM) broadcasts the information associated to an input qubit into a multiqubit system, exploiting a partial a priori knowledge of the input state. This additional a priori information leads to a higher fidelity than for the universal cloning. The present article first analyzes different innovative schemes to implement the 1 -> 3 PQCM. The method is then generalized to any 1 -> M machine for an odd value of M by a theoretical approach based on the general angular momentum formalism. Finally different experimental schemes based either on linear or nonlinear methods and valid for single photon polarization encoded qubits are discussed.
2007
01 Pubblicazione su rivista::01a Articolo in rivista
Implementation of optimal phase-covariant cloning machines / Sciarrino, Fabio; DE MARTINI, Francesco. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 76:1(2007), pp. 012330-1-012330-6. [10.1103/physreva.76.012330]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/232309
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