Experimental Optimal Cloning of Four-Dimensional Quantum States of Photons

Year: 2010

Authors: Nagali E., Giovannini D., Marrucci L., Slussarenko S., Santamato E., Sciarrino F.

Autors Affiliation: Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Univ Naples Federico 2, Dipartimento Sci Fis, I-80126 Naples, Italy; CNR SPIN, I-80126 Naples, Italy; Ist Nazl Ottica, CNR, I-50125 Florence, Italy.

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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 105 (7)      Pages from: 73602-1  to: 73602-4

More Information: This work was supported by project HYTEQ-FIRB, Finanziamento Ateneo 2009 of Sapienza Universita di Roma, and European project PHORBITECH of the FET program (Grant No. 255914).
KeyWords: Systems; Qubits
DOI: 10.1103/PhysRevLett.105.073602

ImpactFactor: 7.622
Citations: 74
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