Resonance Fluorescence from a Coherently Driven Semiconductor Quantum Dot in a Cavity. A. Muller, E. B. Flagg, P. Bianucci, X. Y. Wang, D. G. Deppe, W. Ma, J. Zhang, G. J. Salamo, M. Xiao and C. K. Shih in Phys. Rev. Lett. 99:187402 (2007).  What the paper says!?

This reports the first observation of resonance fluorescence of a single quantum dot. In the words of the Authors:

This Letter presents the first measurement of resonance fluorescence in a single self-assembled quantum dot.

This focuses on the possibility to coherently drive the dot and collects its emission. The emphasis is thus on the high (Mollow) driving but actually also encompasses the low (Heitler) driving.

The configuration is a jewel of light-matter engineering: a planar cavity guides the laser towards the QD, which emits in the perpendicular direction. Everything is collected and directed where it should be. The sample itself is at He cryostat temperature while the laser is at room temperature and brought within a few microns of the cleaved sample edge.

The analysis is in time, through $g^{(1)}(\tau)$ that is seen to oscillate due to the laser dressing the resonance:

The text is well-detailed and well-written.

The Authors feel they have to apologize for their simple (quantum optical) model working so well

(they later add «Furthermore, the present model may not be valid at higher intensities.»)

This was highly topical at the time: