Ashok Ajoy, Paola Cappellaro
We propose a novel Hamiltonian engineering method in spin-based quantum information processing architectures that requires no local control but only relies on collective spin rotations and field gradients. The technique relies on coupling engineering via the time-domain construction of a Bragg grating and a weighting function that modulate the coupling strengths. As an example, we demonstrate how to engineering the optimal Hamiltonian for perfect quantum information transport between two separated nodes of a large spin network. We engineer a spin chain with optimal couplings from a large spin network, such as naturally occurring in crystals, while decoupling all unwanted interactions. We show that for realistic experimental parameters this Hamiltonian engineering method could be used for perfect quantum information transport at room-temperature.
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http://arxiv.org/abs/1208.3656
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