Coherent Optical Control of Quantum Dot Exciton Superposition

Experimental demonstration was made of coherent optical control of single-dot exciton by a phase-locked pulse train (right figure): The first pulse creates an exciton coherent superposition that is alterd by the following pulses with phase control. Left figure (a) top view of the InGaAs quantum dot array, and (b) cross-sectional view of an isolated structure showing disk-shaped InGaAs region buried in Al-rich alloy.