  Electronic transport properties of two quantum dots side-coupled to a quantum
wire are studied by means of the two impurity Anderson Hamiltonian. The
conductance is found to be a superposition of a Fano and a Breit-Wigner
resonances as a function of the Fermi energy, when the gate voltages of the
quantum dots are slightly different. Under this condition, we analyze the time
evolution of a Gaussian-shaped superposition of plane waves incoming from the
source lead, and found that the wave packet can be splitted into three packets
at the drain lead. This spatial pattern manifests in a direct way the
peculiarities of the conductance in energy space. We conclude that the device
acts as a quantum electron splitter.
