Physics – Quantum Physics
Scientific paper
2005-06-27
Int. J. Quant. Inf. 4, 507 (2006)
Physics
Quantum Physics
10 pages, 3 figures. Contribution to the Proceedings of the Workshop on "Quantum entanglement in physical and information scie
Scientific paper
10.1142/S0219749906001955
We introduce a general scheme to realize perfect quantum state reconstruction and storage in systems of interacting qubits. This novel approach is based on the idea of controlling the residual interactions by suitable external controls that, acting on the inter-qubit couplings, yield time-periodic inversions in the dynamical evolution, thus cancelling exactly the effects of quantum state diffusion. We illustrate the method for spin systems on closed rings with XY residual interactions, showing that it enables the massive storage of arbitrarily large numbers of local states, and we demonstrate its robustness against several realistic sources of noise and imperfections.
Giampaolo Salvatore M.
Illuminati Fabrizio
Lisi Antonio Di
Mazzarella Giovanni
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