Phys. Rev. A 70, 062308 (2004) [4 pages]Quantum cloning in spin networksReceived 11 February 2004; published 8 December 2004 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 1→2 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 N→M 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.062308
DOI:
10.1103/PhysRevA.70.062308
PACS:
03.67.Hk, 05.50.+q, 42.50.−p, 89.75.Hc
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