State transfer in intrinsic decoherence spin channels

Quantum Information

Abstract

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 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Department of Applied Mathematics and Applied PhysicsXi’an Institute of Posts and TelecommunicationsXi’anP.R. China

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