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

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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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