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Dynamical spin-spin coupling of quantum dots
We carried out a nested Schrieffer-Wolff transformation of an Anderson
two-impurity Hamiltonian to study the spin-spin coupling between two dynamical
quantum dots under the influence of rotating transverse magnetic field. As a
result of the rotating field, we predict a novel Ising type spin-spin coupling
mechanism between quantum dots, whose strength is tunable via the magnitude of
the rotating field. The strength of the new coupling could be comparable to the
strength of the RKKY coupling. The dynamical coupling with the intristic RKKY
coupling enables to construct a four level system of maximally entangled Bell
states in a controllable manner
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