Obiettivo Goal of the present project is the investigation of semiconductor-based implementation of Quantum Information processing devices. Our interest is directed towards a specific class of novel nanostructures: single and coupled semiconductor QDots. The possibility of a large-scale integration for these structures makes them ideal candidates for the practical solid-state implementation of massive quantum computation. A clear strategy for their implementation as potential quantum-computing devices is still lacking. The proposed research action is of strategic importance since it constitutes the prerequisite for a large-scale integration of quantum-information devices, which is believed to be the "real" technological revolution in the field of quantum computation/information. Goal of the present project is the investigation of semiconductor-based implementation of Quantum Information processing devices. Our interest is directed towards a specific class of novel nanostructures: single and coupled semiconductor QDots. The possibility of a large-scale integration for these structures makes them ideal candidates for the practical solid-state implementation of massive quantum computation. A clear strategy for their implementation as potential quantum-computing devices is still lacking. The proposed research action is of strategic importance since it constitutes the prerequisite for a large-scale integration of quantum-information devices, which is believed to be the "real" technological revolution in the field of quantum computation/information.OBJECTIVESThe primary goal of this project is the design and fabrication of zero-dimensional nano-structures characterised by atomic-like excitations ideally decoupled from the QD environment. Since the prerequisite for any quantum-information processing is the realisation of a fully coherent quantum-mechanical evolution of the computational degrees of freedom, it is essential to realise quantum-mechanical state preparation and manipulation on a time-scale shorter than the dephasing time.To this end, the proposed strategy is twofold:(i) Strong effort will be devoted to the synthesis of nanoscopic systems characterised by interlevel splittings greater than kT;(ii) We choose as computational degrees of freedom specific optical excitations within the QD, which will enable a quantum manipulation on a sub-picosecond time scale.DESCRIPTION OF WORKThe proposed research action is based on a strong interaction between theory and experiments. It will proceed along the following basic lines:a) QD fabrication and characterisation. We will focus on the identification of a prototype quantum-bit based on a highly integrable nanoscopic system. To this end we will fabricate single and coupled QD structures, whose transport and optical properties will be characterised both experimentally and theoretically;b) Ultrafast coherent optical spectroscopy Within he proposed implementation the quantum manipulation of the computational state is envisioned in terms of ultrafast coherent excitation/deexcitation of the QD structures. To this end, the crucial step will be the implementation of coherent-carrier-control techniques;c) Theoretical modelling of QD structures. We will characterise realistic single- and multi-dot structures of potential interest for quantum information encoding. This will require a detailed study of single-particle properties as well as releant Coulomb-interaction mechanisms. In particular few-electron effects will be studied, both in optics and transport;d) Design and Simulations of basic QC operations. We will start modelling single qubit operations based on ultrafast optical excitations. As second step we will address the implementation of two-qubit operations, by means of interdot couplings, e.g. Coulumb correlations, interactions mediated by cavity-modes. Campo scientifico social sciencespolitical sciencespolitical transitionsrevolutionsengineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcomputer hardwarequantum computersnatural sciencesphysical scienceselectromagnetism and electronicssemiconductivitynatural sciencesphysical sciencesopticsspectroscopy Programma(i) FP5-IST - Programme for research, technological development and demonstration on a "User-friendly information society, 1998-2002" Argomento(i) 1.1.2.-6.2.1 - FET P1: Quantum information processing and communications Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore FONDAZIONE ISTITUTO PER L'INTERSCAMBIO SCIENTIFICO Contributo UE Nessun dato Indirizzo VIALE SETTIMIO SEVERO 65 10133 TORINO Italia Mostra sulla mappa Costo totale Nessun dato Partecipanti (7) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto ECOLE NORMALE SUPERIEURE PARIS Francia Contributo UE Nessun dato Indirizzo 45, RUE D'ULM 75230 PARIS CEDEX 05 Mostra sulla mappa Costo totale Nessun dato FORSCHUNGSVERBUND BERLIN E.V. Germania Contributo UE Nessun dato Indirizzo RUDOWER CHAUSSEE 17 12489 BERLIN Mostra sulla mappa Costo totale Nessun dato ISTITUTO NAZIONALE PER LA FISICA DELLA MATERIA Italia Contributo UE Nessun dato Indirizzo CORSO F. PERRONE 24 16152 GENOVA Mostra sulla mappa Costo totale Nessun dato LES INSTITUTS INTERNATIONAUX DE PHYSIQUE ET DE CHIMIE, FONDES PAR ERNEST SOLVAY Belgio Contributo UE Nessun dato Indirizzo AVENUE FRANKLIN ROOSEVELT 50 1050 BRUXELLES Mostra sulla mappa Costo totale Nessun dato POLITECHNIKA WROCLAWSKA Polonia Contributo UE Nessun dato Indirizzo WYBRZEZE WYSPIANSKIEGO 27 50370 WROCLAW Mostra sulla mappa Costo totale Nessun dato UNIVERSITY OF SOUTHAMPTON Regno Unito Contributo UE Nessun dato Indirizzo HIGHFIELD SO17 1BJ SOUTHAMPTON Mostra sulla mappa Costo totale Nessun dato WESTFAELISCHE WILHELMS-UNIVERSITAET MUENSTER Germania Contributo UE Nessun dato Indirizzo SCHLOSSPLATZ 2 48149 MUENSTER Mostra sulla mappa Costo totale Nessun dato
