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Stacked Josephson Junctions in view of macroscopic quantum Experiments (Articolo in rivista)

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Stacked Josephson Junctions in view of macroscopic quantum Experiments (Articolo in rivista) (literal)

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Granata C., Corato V., Monaco A.,Ruggiero B., Russo M.,Silvestrini P. (2001)
Stacked Josephson Junctions in view of macroscopic quantum Experiments
in Applied physics letters
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We describe a novel fabrication process for Nb/AlOx/Nb-Al/AlOx/Nb stacked Josephson junctions, which we propose as 3-terminal elements to control the quantum behaviour of Josephson complex systems. A bias current can be independently injected in the top junction, providing a fine control of the critical current of the bottom junction. (literal)

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Quantum Computation (QC) is expected to be both the unavoidable outcome of the steady process of miniaturisation of computational devices as well as the way to endow computation with features so far unattainable. and quantum gates. The difficulty lies in the feature that QC requires quantum state engineering, namely the controlled preparation of entangled quantum states, as well as their coherent manipulation. One of the goals of any physical implementation of a quantum information-processing device is therefore to control systems of coupled qubits with a phase coherence time sufficiently long to permit the necessar manipulations. Among the most promising candidates of choice appear to be superconducting Josephson systems (SQUIDs or combinations thereof). In this context, devices which allow the control the critical current of the central system (the rf-SQUID) without influencing the decoherence time of the system have been proposed.In this direction all new ideas to increase the insulation between the device and the environment during the external excitation are welcomed and useful in view of new configurations in preparing macroscopic quantum experiments. In this letter we propose to investigate a superconducting stacked device based on two niobium Josephson junctions, as 3-terminal unit to control the quantum behaviour of Josephson complex systems. (literal)

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Istituto di Cibernetica Eduardo Caianiello del Consiglio Nazionale delle Ricerche, I-80072, Arco Felice, Italy (literal)

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Stacked Josephson Junctions in view of macroscopic quantum Experiments (literal)

Abstract

We describe a novel fabrication process for Nb/AlOx/Nb-Al/AlOx/Nb stacked Josephson junctions, which we propose as 3-terminal elements to control the quantum behaviour of Josephson complex systems. A bias current can be independently injected in the top junction, providing a fine control of the critical current of the bottom junction. The reported characterization of the device refers to data in the classical limit including measurements of the switching dynamics between metastable states of the system at different temperatures and bias conditions. At low temperature the effective dissipation of the bottom junction remains substantially unchanged when different injection currents flow in the top junction. These results are interesting to project new configurations of macroscopic quantum experiments. (literal)

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