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Preparation of entangled pairs of coupled two-state systems driven by abichromatic external field is studied. We use a system of two coupled spin-1/2that can be translated into a three-state ladder model whose intermediate staterepresents the entangled state. We show that this entangled state can beprepared in a robust way with appropriate fields. Their frequencies andenvelopes are derived from the topological properties of the model.Comment: 10 pages, 9 figure

Adiabatic creation of entangled states by a bichromatic field designed from the topology of the dressed eigenenergies