Population transfer driven by far-off-resonant fields

TL;DR

This paper introduces a novel scheme for coherent population transfer in a two-level system using far-off-resonant fields, optimized for minimal transfer time and applicable to various driving profiles.

Contribution

It demonstrates that effective population transfer is possible with far-off-resonant driving, challenging previous beliefs, and optimizes parameters for enhanced efficiency.

Findings

The scheme works with constant and Gaussian driving.

Optimized detuning and coupling minimize transfer time.

Sensitivity to spontaneous emission is higher than to dephasing.

Abstract

For a two-level system, it is believed that a far-off-resonant driving can not help coherent population transfer between the states. In this work, we propose a scheme to implement the coherent transfer with far-off-resonant driving. The scheme works well with both constant driving and Gaussian driving. The total time to finish population transfer is also minimized by optimizing the detuning and coupling constants. We find that the scheme is sensitive to spontaneous emission much more than dephasing. It might find potential applications in X-ray quantum optics and population transfer in Rydberg atoms as well.