This page is still in progress.Coherent Optical Spectroscopy of a Strongly Driven Quantum Dot. X. Xu, Bo Sun, P. R. Berman, D. G. Steel, A. S. Bracker, D. Gammon and L. J. Sham in Science 317:929 (2007).  What the paper says!?

This studies the coherent driving of a $\Lambda$ system, going beyond standard resonance fluorescence. This is an important experimental work for this configuration, which we should study (theoretically, the configuration).

Quantum dots are good two-level systems: