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Creation and manipulation of entanglement in spin chains far from equilibrium

Creation and manipulation of entanglement in spin chains far from equilibrium,10.1140/epjst/e2010-01220-5,European Physical Journal-special Topics,F.

Creation and manipulation of entanglement in spin chains far from equilibrium  
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.   We investigate creation, manipulation, and steering of entanglement in spin chains from the viewpoint of quantum communication between distant parties. We demonstrate how global parametric driving of the spin-spin coupling and/or local time-dependent Zeeman fields produce a large amount of entanglement between the first and the last spin of the chain. This occurs whenever the driving frequency meets a resonance condition, identified as “entanglement resonance”. Our approach marks a promising step towards an efficient quantum state transfer or teleportation in solid state system. Following the reasoning of Zueco et al. [1], we propose generation and routing of multipartite entangled states by use of symmetric tree-like structures of spin chains. Furthermore, we study the effect of decoherence on the resulting spin entanglement between the corresponding terminal spins.
Journal: European Physical Journal-special Topics - EUR PHYS J-SPEC TOP , vol. 180, no. 1, pp. 237-246, 2009
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