Experimental Optimal Cloning of Four-Dimensional Quantum States of Photons

E. Nagali, D. Giovannini, L. Marrucci, S. Slussarenko, E. Santamato, and F. Sciarrino
Phys. Rev. Lett. 105, 073602 – Published 13 August 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.

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  • Received 9 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.073602

© 2010 The American Physical Society

Authors & Affiliations

E. Nagali1, D. Giovannini1, L. Marrucci2,3, S. Slussarenko2, E. Santamato2, and F. Sciarrino1,4,*

  • 1Dipartimento di Fisica dell’Università “La Sapienza,” Roma 00185, Italy
  • 2Dipartimento di Scienze Fisiche, Università di Napoli “Federico II,” Complesso Universitario di Monte S. Angelo, 80126 Napoli, Italy
  • 3CNR-SPIN, Complesso Universitario di Monte S. Angelo, 80126 Napoli, Italy
  • 4CNR-Istituto Nazionale di Ottica, Firenze, Italy

  • *fabio.sciarrino@uniroma1.it

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Vol. 105, Iss. 7 — 13 August 2010

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