Adiabatic steering and determination of dephasing rates in double-dot qubits - art. no. 035319

We propose a scheme to prepare arbitrary superpositions of quantum states i n double quantum dots irradiated by coherent microwave pulses. Solving the equations of motion for the dot-density matrix, we find that dephasing rate s for such superpositions can be quantitatively inferred from additional el ectron-current pulses that appear due to a controllable breakdown of cohere nt population trapping in the dots.