Advanced Concepts in Josephson Junction Reflection Amplifiers

P Lähteenmäki (Corresponding Author), Visa Vesterinen, Juha Hassel, G S Paraoanu, Heikki Seppä, P Hakonen

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    13 Citations (Scopus)


    Low-noise amplification at microwave frequencies has become increasingly important for the research related to superconducting qubits and nanoelectromechanical systems. The fundamental limit of added noise by a phase-preserving amplifier is the standard quantum limit, often expressed as noise temperature (Formula presented.). Towards the goal of the quantum limit, we have developed an amplifier based on intrinsic negative resistance of a selectively damped Josephson junction. Here we present measurement results on previously proposed wide-band microwave amplification and discuss the challenges for improvements on the existing designs. We have also studied flux-pumped metamaterial-based parametric amplifiers, whose operating frequency can be widely tuned by external DC-flux, and demonstrate operation at (Formula presented.) pumping, in contrast to the typical metamaterial amplifiers pumped via signal lines at (Formula presented.)
    Original languageEnglish
    Pages (from-to)868-876
    JournalJournal of Low Temperature Physics
    Issue number5-6
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed


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