This online presentation describes process from the light energy as electronic excitation to the reaction center within picoseconds. They have found out that there is surprisingly long-lived electronic coherences in this process. In this presentation, the presenter also discusses the theoretical studies of the quantum dynamics of a prototypical photosynthetic light harvesting complex, the Fenna-Metthews-Olson (FMO) complex, which is helpful for me to understand the function of FMO.