Obiettivo The project aims at fabrication of systems of quantum logic gates by developing Josephson Junction (JJ) and SQUID technologies to achieve initialisation, processing and read-out of super conducting qubit information. The first objective is to improve single-qubit technologies for hybrid charge and flux qubits, and to control the coherence properties and the dynamics of single qubit operations. The major objective is to fabricate and control several coupled JJ qubits, to operate universal logic gates and to test circuits for multi-qubit entanglement and simple quantum algorithms. The final objective is to gain sufficient knowledge for a realistic assessment of the scalability of Josephson junction technologies for information processing, contributing to a "Roadmap for Quantum Computing".OBJECTIVESThe proposal concerns development of an elementary scalable quantum processor using Josephson junction (charge and flux state) qubits, single-electron and SQUID technologies to achieve initiation, processing and read-out of information. The first objective is to improve and maintain coherence of several types of single qubits long enough for relevant operations to be performed. The major objective is to operate universal quantum gates using Josephson junction circuits, and to test circuits for entanglement of multi-qubit systems. In parallel, a theoretical analysis of the dynamics of qubit systems and quantum gates will be continued. Major objectives involve design optimisation, non-destructive control of qubit systems, effects of quantum leakage on multi-qubit operations, and fidelity of simple quantum algorithms.DESCRIPTION OF WORKThe conceptual focus of research lies in "Quantum computing and communications" while the technologies employed fall within the area of "Nano-technology information devices". Low -capacitance super conducting tunnel junctions have a unique potential for buildings sufficiently large scale, still controllable coherent systems of qubits of information with long decoherence time. They represent one of the most promising and realistic approaches for creating a technology of quantum computers. At low temperatures the circuit variables (flux and charge) at the circuit nodes behave quantum mechanically. One can use external potentials on gate electrodes and external magnetic fields in SQUID loops to vary the quantum mechanical coupling in the systems; and tune the coherent superposition with external control "knobs" is an important step towards implementation of quantum computing schemes. Furthermore, the fact that one can design the circuit using standard electron lithography techniques makes them most appropriate for physical implementation. The role of dissipation and its influence on decoherence requires careful investigation and optimisation. A very important step was recently demonstrated by Vion et al.(submitted to science), who succeeded to manipulate Josephson junction quibits in a quantum coherent way over nearly one microsecond. The SQUIBIT-2 team successfully works with this technology and is therefore in an excellent position to accomplish real progress toward controllable few-qubit gates and eventually an elementary quantum processor using scalable solid-state nano-technology. Campo scientifico engineering and technologynanotechnologyengineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcomputer hardwarequantum computersnatural sciencescomputer and information sciencesdata sciencedata processing Programma(i) FP5-IST - Programme for research, technological development and demonstration on a "User-friendly information society, 1998-2002" Argomento(i) IST-2002-6.2.1 - Quantum Information Processing and Communication (QIPC) Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore CHALMERS TEKNISKA HOEGSKOLA AKTIEBOLAG Contributo UE Nessun dato Indirizzo 412 96 GOETEBORG Svezia Mostra sulla mappa Costo totale Nessun dato Partecipanti (8) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto COMMISSARIAT A L'ENERGIE ATOMIQUE Francia Contributo UE Nessun dato Indirizzo 31-33 RUE DE LA FEDERATION 75752 PARIS CEDEX 15 Mostra sulla mappa Costo totale Nessun dato HELSINKI UNIVERSITY OF TECHNOLOGY Finlandia Contributo UE Nessun dato Indirizzo OTAKAARI 1 02015 ESPOO Mostra sulla mappa Costo totale Nessun dato JYVAESKYLAEN YLIOPISTO Finlandia Contributo UE Nessun dato Indirizzo SEMINAARINKATU 15 40100 JYVASKYLA Mostra sulla mappa Costo totale Nessun dato KUNGLIGA TEKNISKA HOEGSKOLAN Svezia Contributo UE Nessun dato Indirizzo Valhallavaegen 79 STOCKHOLM Mostra sulla mappa Collegamenti Sito web Opens in new window Costo totale Nessun dato PHYSIKALISCH-TECHNISCHE BUNDESANSTALT Germania Contributo UE Nessun dato Indirizzo BUNDESALLEE 100 38116 BRAUNSCHWEIG Mostra sulla mappa Costo totale Nessun dato SCUOLA NORMALE SUPERIORE Italia Contributo UE Nessun dato Indirizzo PIAZZA DEI CAVALIERI 7 56126 PISA Mostra sulla mappa Costo totale Nessun dato TECHNISCHE UNIVERSITEIT DELFT Paesi Bassi Contributo UE Nessun dato Indirizzo JULIANALAAN 134 2628 BL DELFT Mostra sulla mappa Costo totale Nessun dato UNIVERSITAET KARLSRUHE (TH) Germania Contributo UE Nessun dato Indirizzo KAISERSTRASSE 12 76131 KARLSRUHE Mostra sulla mappa Costo totale Nessun dato