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SEMICONDUCTOR-BASED IMPLEMENTATION OF QUANTUM INFORMATION DEVICES

Project information

Grant agreement ID: IST-1999-11311

  • Start date

    1 January 2000

  • End date

    31 December 2002

Funded under:

FP5-IST

  • Overall budget:

    € 2 067 066

  • EU contribution

    € 1 837 000

Coordinated by:

FONDAZIONE ISTITUTO PER L'INTERSCAMBIO SCIENTIFICO

Italy

Objective

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.

Coordinator

FONDAZIONE ISTITUTO PER L'INTERSCAMBIO SCIENTIFICO

Address

Viale Settimio Severo 65
10133 Torino

Italy

Participants (7)

ECOLE NORMALE SUPERIEURE PARIS

France

FORSCHUNGSVERBUND BERLIN E.V.

Germany

ISTITUTO NAZIONALE PER LA FISICA DELLA MATERIA

Italy

LES INSTITUTS INTERNATIONAUX DE PHYSIQUE ET DE CHIMIE, FONDES PAR ERNEST SOLVAY

Belgium

POLITECHNIKA WROCLAWSKA

Poland

UNIVERSITY OF SOUTHAMPTON

United Kingdom

WESTFAELISCHE WILHELMS-UNIVERSITAET MUENSTER

Germany

Project information

Grant agreement ID: IST-1999-11311

  • Start date

    1 January 2000

  • End date

    31 December 2002

Funded under:

FP5-IST

  • Overall budget:

    € 2 067 066

  • EU contribution

    € 1 837 000

Coordinated by:

FONDAZIONE ISTITUTO PER L'INTERSCAMBIO SCIENTIFICO

Italy