DESDE

Decoherence in Superconducting Devices

 Coordinatore FORSCHUNGSZENTRUM JUELICH GMBH 

 Organization address address: Leo-Brandt-Strasse
city: JUELICH
postcode: 52425

contact info
Titolo: Ms.
Nome: Gelinde
Cognome: Riese
Email: send email
Telefono: +49 2461 61 1854

 Nazionalità Coordinatore Germany [DE]
 Totale costo 100˙000 €
 EC contributo 100˙000 €
 Programma FP7-PEOPLE
Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
 Code Call FP7-PEOPLE-2013-CIG
 Funding Scheme MC-CIG
 Anno di inizio 2013
 Periodo (anno-mese-giorno) 2013-08-01   -   2017-07-31

 Partecipanti

# participant  country  role  EC contrib. [€] 
1    FORSCHUNGSZENTRUM JUELICH GMBH

 Organization address address: Leo-Brandt-Strasse
city: JUELICH
postcode: 52425

contact info
Titolo: Ms.
Nome: Gelinde
Cognome: Riese
Email: send email
Telefono: +49 2461 61 1854

DE (JUELICH) coordinator 100˙000.00

Mappa

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quantum    computation    photons    superconducting    coherence    superconductors    decoherence    metrology    interactions   

 Obiettivo del progetto (Objective)

'A hallmark of quantum mechanics is the coherent superposition of states of a system, but uncontrolled interactions between system and environment lead to loss of coherence. For applications such as quantum computation and quantum metrology coherence must be preserved, and to obtain long coherence times a promising approach is to capitalize on the quantum properties of superconductors. Indeed many superconducting devices based on Josephson junctions are under active experimental investigation. This project has two main goals: to advance our theoretical understanding of decoherence processes in such superconducting devices and to explore how to limit their detrimental effects. The initial focus will be on the intrinsic decoherence due to quasiparticles, the elementary excitations in superconductors, especially under non-equilibrium conditions. The peculiarities of single, few, and many junction systems (such as transmon, phase and flux qubits, Cooper pair pumps, fluxonium, etc.) will be addressed in detail. Then the effectiveness of quasiparticle trapping schemes will be studied. In addition, interactions with photons will also be considered: on one hand, photons are used to manipulate these systems, on the other they cause decoherence, and the optimal balance between these two conflicting aspects will be sought. By suggesting new ways to reduce decoherence, the results of this project can contribute to the improvements in the performance of superconducting devices that will enable their practical use for quantum computation and metrology.'

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