Quantum cloning in spin networks
量子物理
2009-11-10 v2 介观与纳米尺度物理
摘要
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.
引用
@article{arxiv.quant-ph/0402071,
title = {Quantum cloning in spin networks},
author = {G. De Chiara and R. Fazio and C. Macchiavello and S. Montangero and G. M. Palma},
journal= {arXiv preprint arXiv:quant-ph/0402071},
year = {2009}
}
备注
10 pages, 3 figures, minor corrections, references updated, published version