Optimal quantum cloning is the process of making one or more copies of an arbitrary unknown input quantum state with the highest possible fidelity. All reported demonstrations of quantum cloning have so far been limited to copying two-dimensional quantum states, or qubits. We report the experimental realization of the optimal quantum cloning of four-dimensional quantum states, or ququarts, encoded in the polarization and orbital angular momentum degrees of freedom of photons. Our procedure, based on the symmetrization method, is also shown to be generally applicable to quantum states of arbitrarily high dimension-or qudits-and to be scalable to an arbitrary number of copies, in all cases remaining optimal. Furthermore, we report the bosonic coalescence of two single-particle entangled states.

Experimental Optimal Cloning of Four-Dimensional Quantum States of Photons / Nagali, Eleonora; D., Giovannini; L., Marrucci; S., Slussarenko; E., Santamato; Sciarrino, Fabio. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 105:7(2010). [10.1103/physrevlett.105.073602]

Experimental Optimal Cloning of Four-Dimensional Quantum States of Photons

NAGALI, ELEONORA;SCIARRINO, Fabio
2010

Abstract

Optimal quantum cloning is the process of making one or more copies of an arbitrary unknown input quantum state with the highest possible fidelity. All reported demonstrations of quantum cloning have so far been limited to copying two-dimensional quantum states, or qubits. We report the experimental realization of the optimal quantum cloning of four-dimensional quantum states, or ququarts, encoded in the polarization and orbital angular momentum degrees of freedom of photons. Our procedure, based on the symmetrization method, is also shown to be generally applicable to quantum states of arbitrarily high dimension-or qudits-and to be scalable to an arbitrary number of copies, in all cases remaining optimal. Furthermore, we report the bosonic coalescence of two single-particle entangled states.
2010
01 Pubblicazione su rivista::01a Articolo in rivista
Experimental Optimal Cloning of Four-Dimensional Quantum States of Photons / Nagali, Eleonora; D., Giovannini; L., Marrucci; S., Slussarenko; E., Santamato; Sciarrino, Fabio. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 105:7(2010). [10.1103/physrevlett.105.073602]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/140030
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