Andrea Bertoni

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It is shown that the universal set of quantum logic gates can be realized using solid-state quantum bits based on coherent electron transport in quantum wires. The elementary quantum bits are realized with a proper design of two quantum wires coupled through a potential barrier. Numerical simulations show that (a) a proper design of the coupling barrier(More)
In the last decades it has become clear that a rigorous quantum approach to electron transport in nano-device design is necessary, not only for the solution of problems where quantum effects are essential but also for testing the semiclassical approximation by comparison with exact quantum results obtained for the very same system. The Wigner-function(More)
The control of orbitals and spin states of single electrons is a key ingredient for quantum information processing and novel detection schemes and is, more generally, of great relevance for spintronics. Coulomb and spin blockade in double quantum dots enable advanced single-spin operations that would be available even for room-temperature applications with(More)
We use a configuration-interaction approach and the Fermi golden rule to investigate electron-phonon interaction in multielectron quantum dots. Lifetimes are computed in the low-density, highly correlated regime. We report numerical evidence that electron-electron interaction generally leads to reduced decay rates of excited electronic states in weakly(More)
We study by means of time-dependent numerical simulations the behavior of the entanglement stemming from the Coulomb scattering between two electrons subjected to a pulse of sinusoidal potential or trapped in the potential generated by surface acoustic waves. In the first case, we show how the entanglement formation depends upon the physical parameters(More)
Surface acoustic waves (SAW) have proved to be a valuable mean to control single-electron dynamics in nano-devices. In this paper, we study the coherent propagation of electrons in quantum wires driven by SAW, as a part of a feasibility study on a coupled quantum wires device, able to realize the basic operations needed for quantum computing. Such a system(More)
We develop a novel approach to treat excitation energy transfer in hybrid nanosystems composed by an organic molecule attached to a semiconductor nanoparticle. Our approach extends the customary Förster theory by considering interaction between transition multipole moments of the nanoparticle at all orders and a point-like transition dipole moment(More)
We study the electronic states of core multishell semiconductor nanowires, including the effect of strong magnetic fields. We show that the multishell overgrowth of a free-standing nanowire, together with the prismatic symmetry of the substrate, may induce quantum confinement of carriers in a set of quasi-1D quantum channels corresponding to the nanowire(More)
We study by means of time-dependent numerical simulations the behavior of the entanglement stemming from the Coulomb scattering between two charged particles subject to a pulse of sinusoidal potential. We show that the splitting of the spatial wavefunction brought about by the interaction with the potential pulse plays a key role in the appearance of(More)