Objective
The consortium aims at investigations of quantum-coherent phenomena in super-conducting nanocircuits, based on Josephson junctions, and the analysis of the effect of dissipation. The major goals include development of Josephson quantum-bit circuits tolerant to external noise; analysis of the nature and statistical properties of noise using Josephson qubits; investigations of the fundamental Landau-Zener interference phenomena in driven quantum bits and exploration of their use for technologies for qubit manipulation and readout; development, description and optimisation of efficient Josephson quantum detectors.
Specifically, the research will focus on questions relevant for the development of quantum-coherent nanodevices and for the understanding of their behaviour:
(i) the theoretical investigation and experimental implementation of noise-tolerant Josephson quantum devices based on the use of topological protection of quantum ground-states: this includes studies of the simplest realizations based on tetrahedral quantum bits and on Josephson rhombi chains, both magnetically frustrated and frustrated via pi-junctions;
(ii) analysis of quantum-interference phenomena in Josephson qubit circuits and their use for qubit manipulation and read-out;
(iii) development of low-backaction, high-sensitivity fast quantum detectors, dispersive and based on the Landau-Zener interference patterns;
(iv) investigation of the effect of decoherence on the quantum-coherent phenomena in Josephson circuits, specifically, interference patterns and coherent transport; analysis of noise using quantum bits as spectral analysers.
As a result of our research in this project, we expect to provide the basis for operation of protected Josephson qubits; demonstrate high-efficiency quantum detectors; gather information on the properties of the noise sources that suppress coherence of these devices.
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KARLSRUHE
Germany