Coherent superpositions of electronic states generate rapid charge migration and it is essential to pursue ultralong-lived charge migration in molecules. Here, we design a polarized pulse train to enhance and maintain charge migration in ionized iodoacetylene (${\mathrm{HCCI}}^{+}$). By sequentially tuning the carrier-envelope phases of these short pulses, we achieve equal populations of the ground and first excited states while maintaining high nuclear overlap. Compared to the field-free scenario, both the amplitude and duration of charge migration are improved. This approach offers a robust framework for electronic coherence control and can be readily extended to more complex molecular systems.

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• Charge migration