Quantum cloning in spin networks

Gabriele De Chiara, Rosario Fazio, Chiara Macchiavello, Simone Montangero, and G. Massimo Palma
Phys. Rev. A 70, 062308 – Published 8 December 2004

Abstract

We introduce an approach to quantum cloning based on spin networks and we demonstrate that phase covariant cloning can be realized using no external control but only with a proper design of the Hamiltonian of the system. In the 12 cloning we find that the XY model saturates the value for the fidelity of the optimal cloner and gives values comparable to it in the general NM case. We finally discuss the effect of external noise. Our protocol is much more robust to decoherence than a conventional procedure based on quantum gates.

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  • Received 11 February 2004

DOI:https://doi.org/10.1103/PhysRevA.70.062308

©2004 American Physical Society

Authors & Affiliations

Gabriele De Chiara1, Rosario Fazio1, Chiara Macchiavello2, Simone Montangero1, and G. Massimo Palma3

  • 1NEST-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
  • 2INFM and Dipartimento di Fisica “A. Volta,” Via Bassi 6, I-27100 Pavia, Italy
  • 3NEST-INFM and Dipartimento di Tecnologie dell’Informazione, Università degli studi di Milano, via Bramante 65, I-26013 Crema(CR), Italy

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Issue

Vol. 70, Iss. 6 — December 2004

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