Fast enantioconversion of chiral mixtures based on effective two-level models.

We propose an interesting method for the fast enantioconversion of chiral mixtures, leveraging a modified four-level double-Δ model that operates entirely through coherent interactions. By simplifying the model to an effective two-level system, we eliminate the need for intermediate achiral excited states and their associated time-consuming relaxation steps. This approach accelerates enantioconversion by directly evolving the two chiral ground states through population transfer, offering a more efficient alternative to traditional methods such as laser distillation. Our method, which obviates the need for precise pulse shape control, enables highly efficient enantiomeric conversion on the microsecond timescale. This improvement is particularly beneficial in experimental conditions with limited operational time or short enantiomeric lifetimes, making it a powerful tool for enantioconversion of chiral mixtures.