Manipulation of Dark States and Control of Coherent Processes with Spectrally Broad Light

TL;DR

This paper explores how dark states can be formed and controlled using broadband incoherent light, demonstrating high-efficiency population transfer similar to laser-driven processes through spectral and polarization control.

Contribution

It introduces a theoretical framework for dark state formation with broadband light and shows how polarization control can enable efficient population transfer akin to adiabatic passage.

Findings

Dark states can be formed with broadband incoherent light.

High-efficiency population transfer is achievable with polarization control.

Theoretical criteria for adiabaticity were established and validated.

Abstract

The formation of dark states under interaction of degenerate atomic states with incoherent broadband radiation (white light) is discussed. A simple coupling scheme in a three level Lambda-system, which allows both qualitative and quantitative analysis is discussed. We found a stationary solution of the optical Bloch equations in a broad excitation line approximation that describes the dynamics of the atom-white light interaction and demonstrated its identity to a conventional dark state created with coherent laser fields. We than examine the efficiency of the population transfer induced by broadband radiation in a model Lambda-system and revealed that high efficiency (attaining 100 percent) of stimulated Raman adiabatic passage-like processes can be achieved with certain temporal control of light polarization. The corresponding criterion of adiabaticity was formulated and justified by means of numerical simulations.