Solid-state implementation of quantum computation promises scalability to a large number of qubits (two level systems) and benefits from recent advances in fabrication and characterization of quantum dots. Furthermore, using the spin of an electron confined in a quantum nanostructureas the qubit degree of freedom seems highly promising for quantum information processing due to its relatively long spin dephasing time. An all-optical method for the implementation of quantum computation shall be presented, in which the quantum memory is represented by the spin of an excess electron stored in a quantum dot and state selectivity is achieved via conditional laser excitation exploiting Pauli exclusion principle. The main imperfections on the gate performance, present in real quantum dots, shall be described and an adiabatic gate procedure that allows to circumvent them shall be presented.