State transfer in intrinsic decoherence spin channels
Department of Applied Mathematics and Applied Physics, Xi'an Institute of Posts and Telecommunications, 710061, Xi'an, P.R. China
Corresponding author: a email@example.com
Revised: 31 May 2009
Published online: 7 August 2009
By analytically solving the master equation, we investigate quantum state transfer, creation and distribution of entanglement in the model of Milburn's intrinsic decoherence. Our results reveal that the ideal spin channels will be destroyed by the intrinsic decoherence environment, and the detrimental effects become severe as the decoherence rate γ and the spin chain length N increase. For infinite evolution time, both the state transfer fidelity and the concurrence of the created and distributed entanglement approach steady state values, which are independent of the decoherence rate γ and decrease as the spin chain length N increases. Finally, we present two modified spin chains which may serve as near perfect spin channels for long distance state transfer even in the presence of intrinsic decoherence environments.
PACS: 03.67.-a – Quantum information / 03.67.Mn – Entanglement production, characterization, and manipulation / 03.65.Yz – Decoherence; open systems; quantum statistical methods
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009