Quantum cloning in spin networks
arXiv:quant-ph/0402071 · doi:10.1103/PhysRevA.70.062308
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 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 genera 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.
10 pages, 3 figures, minor corrections, references updated, published version
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