Characterization of SQUID-based null detector for a quantum metrology triangle experiment

Juho Luomahaara, A. Kemppinen, Panu Helistö, Juha Hassel

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)


    We present characterization of a null detector designed for an experiment aimed to close the quantum metrological triangle (QMT). The device is a SQUID amplifier equipped with a large winding-ratio planar input transformer improving the current resolution. We demonstrate equivalent input current noise down to 14 fA/Hz1/2 . Furthermore, operation in a realistic environment of a dry dilution refrigerator hosting the QMT experiment is studied. We discuss particular challenges set by such system as the cryogenics introduces relatively large magnetic interference. We present data from measurements simulating the final QMT experiment and introduce the requirements for the averaging and bias reversal.
    Original languageEnglish
    Article number1601705
    Number of pages5
    JournalIEEE Transactions on Applied Superconductivity
    Issue number3
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed
    EventApplied Superconductivity Conference, ASC 2012 - Portland, United States
    Duration: 7 Oct 201212 Oct 2012


    • quantum metrological triangle
    • SQUID ammeter


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