We use differential spectroscopy to temporally and spectrally resolve the oscillations of electron tunneling processes between the quantum well (QW) and quantum dot (QD) excited states. Previously, our measurements revealed a strong effect of a QW incorporated into a QD structure on the density of states of the system and the efficiency of carrier transfer from the barrier material to QDs in InAs/GaAs–InGaAs/GaAs dot-well, tunnel-injection structures [1]. These measurements also indicated the existence of coherent tunneling of carriers when ground state of the QW is in resonance with one of the excited states of QDs. In addition, observation of shape change of the photoluminescence (PL) line as a function of the thickness of the barrier between QW and QDs prompted the consideration of Fano like interference between the emissions from QW and QDs [2]. To investigate in details the possible coherent tunneling and Fano-like interference of the narrow emission from the QW with the broad emission of the QDs, we carried out a number of degenerate pump-probe studies of the dynamics in the 2D-0D hybrid systems with special attention paid to the regime of strong coupling, which is achieved in the case of thin barriers. Main features of the dynamics in the coherent tunneling are qualitatively modeled by a set of optical Bloch equations describing the polarization evolution in the three-level system shown in Fig. 1. The predicted period of oscillations in the detected reflection signal compares favorably with the experiment (Fig. 2). The account for such nonlinear effects as excitation induced dephasing (EID) and excitation induced shift (EIS) has been included in the numerical modeling of OBE describing the hybrid system.figureFig.1 Simplified energy structure of QW-QD system.Fig. 2 Experimental time resolved data[1] Yu. I. Mazur, V. G. Dorogan, E. Marega, Jr., M. Benamara, Z. Ya. Zhuchenko, G. G. Tarasov, C. Lienau, and G. J. Salamo, Appl. Phys. Lett., 98 (2011) 083118. [2] Yu. I. Mazur, et al., Phys. Rev. B, 82 (2010) 155413