Optimizing charge dynamics in quantum dot systems

The current mission to design, develop and implement solid-state quantum computing processes invokes the need to control the charge dynamics within a device coherently. Devices built on quantum dot technology can be simulated as combinations of single-/many-particle quantum wells that could be implemented as computational qubits. Here we solve, via exact diagonalization, the states of a single-electron quantum dot system, utilizing the OCTOPUS software package. Following, we implement from the same software, quantum optimal control theory (QOCT), to determine an optimal laser field that transitions a single charge from an initial state to the desired target state, (i) minimizing the time of transition and (ii) maximizing the overlap between the obtained final state and chosen target state. Both goals can be met while remaining within the range of experimentally accessible frequencies, aiding in bridging the gap between theory and experiment. Consequently, these results can provide insight into the development, initialization, and control of quantum dot systems for use in the design of solid-state quantum information devices.