Characterization of SQUID-Based Null Detector for a Quantum Metrology Triangle Experiment

被引：4
作者：
Luomahaara, Juho [1 ]
Kemppinen, Antti [2 ]
Helisto, Panu [1 ]
Hassel, Juha [1 ]
机构：
[1] VTT Tech Res Ctr Finland, FIN-02044 Espoo, Finland
[2] Ctr Metrol & Accreditat MIKES, FIN-02151 Espoo, Finland
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2013年 / 23卷 / 03期
基金：
芬兰科学院;
关键词：
Quantum metrological triangle; SQUID ammeter;
D O I：
10.1109/TASC.2012.2237212
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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/Hz(1/2). 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.
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页数：5
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