  We theoretically describe a driven two-electron four-level double-quantum dot
(DQD) tunnel coupled to a fermionic sea by using the rate-equation formalism.
This approach allows to find occupation probabilities of each DQD energy level
in a relatively simple way, compared to other methods. Calculated dependencies
are compared with the experimental results. The system under study is
irradiated by a strong driving signal and as a result, one can observe
Landau-Zener-Stuckelberg-Majorana (LZSM) interferometry patterns which are
successfully described by the considered formalism. The system operation regime
depends on the amplitude of the excitation signal and the energy detuning,
therefore, one can transfer the system to the necessary quantum state in the
most efficient way by setting these parameters. Obtained results give insights
about initializing, characterizing, and controlling the quantum system states.
