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We report on coherent emission of the neutral exciton state in a singlesemiconductor self-assembled InAs/GaAs quantum dot embedded in aone-dimensional waveguide, under resonant picosecond pulsed excita- tion.Direct measurements of the radiative lifetime and coherence time are performedas a function of excitation power and temperature. The characteristic dampingof Rabi oscillations which is observed, is attributed to an excitation-induceddephasing due to a resonant coupling between the emitter and the acousticphonon bath of the matrix. Other sources responsible for the decrease of thecoherence time have been evidenced, in particular an enhancement of theradiative recombination rate due to the resonant strong coupling between thedot and the one-dimensional optical mode. As a consequence, the emissioncouples very efficiently into the waveguide mode leading to an additionalrelaxation term of the excited state population.

Excitation-induced dephasing in a resonantly driven InAs/GaAs quantum dot