Objectif
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.
OBJECTIVES
The 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 WORK
The 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.
Champ scientifique
- social sciencespolitical sciencespolitical transitionsrevolutions
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcomputer hardwarequantum computers
- natural sciencesphysical scienceselectromagnetism and electronicssemiconductivity
- natural sciencesphysical sciencesopticsspectroscopy
Appel à propositions
Data not availableRégime de financement
CSC - Cost-sharing contractsCoordinateur
10133 TORINO
Italie