Low-noise current amplifier based on mesoscopic Josephson junction

J. Delahaye (Corresponding Author), Juha Hassel, R. Lindell, M. Sillanpää, M. Paalanen, Heikki Seppä, P. Hakonen

    Research output: Contribution to journalArticleScientificpeer-review

    61 Citations (Scopus)


    We used the band structure of a mesoscopic Josephson junction to construct low-noise amplifiers. By taking advantage of the quantum dynamics of a Josephson junction, i.e., the interplay of interlevel transitions and the Coulomb blockade of Cooper pairs, we created transistor-like devices, Bloch oscillating transistors, with considerable current gain and high-input impedance. In these transistors, the correlated supercurrent of Cooper pairs is controlled by a small base current made up of single electrons. Our devices reached current and power gains on the order of 30 and 5, respectively. The noise temperature was estimated to be around 1 kelvin, but noise temperatures of less than 0.1 kelvin can be realistically achieved. These devices provide quantum-electronic building blocks that will be useful at low temperatures in low-noise circuit applications with an intermediate impedance level.
    Original languageEnglish
    Pages (from-to)1045-1048
    Number of pages4
    Issue number5609
    Publication statusPublished - 2003
    MoE publication typeA1 Journal article-refereed


    • Josephson junction


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