Highly Sensitive DC SQUID Arrays for the Readout of Optical TES at mK Temperatures

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Transactions on Applied Superconductivity Pub Date : 2025-02-20 DOI:10.1109/TASC.2025.3543941

Matthias Schmelz;Vitaliy Shvab;Katja Peiselt;Jürgen Kunert;Vyacheslav Zakosarenko;Thomas Stöhlker;Gregor Oelsner;Ronny Stolz

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Abstract

In this article, we present advancements of our submicrometer cross-type

$\text{Nb}/ \text{AlO}_{x}/ \text{Nb}$

Josephson junction technology by implementing an additional highly conductive resistive layer, e.g., for thermalization structures. This allows for shifting the typically observed thermal decoupling of shunt resistors of highly sensitive dc superconducting quantum interference devices (SQUIDs) and SQUID arrays down to temperatures in the millikelvin range. We show results on the technological integration, device design of series SQUID arrays, and their characterization at 4.2 K down to 65 mK. Measurements were performed in an adiabatic demagnetization refrigerator. As an application scenario, we have successfully implemented them as readout circuitry for optical transition edge sensors operated at 150 mK requiring both low-noise and large bandwidth of the readout implemented in a flux-locked loop configuration.

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用于mK温度下光学TES读出的高灵敏度直流SQUID阵列

在本文中，我们通过实现额外的高导电性电阻层，例如用于热化结构，介绍了亚微米交叉型约瑟夫森结技术的进展。这允许将高灵敏度直流超导量子干涉器件（SQUID）和SQUID阵列的分流电阻的典型观察到的热去耦降低到毫开尔文范围内的温度。我们展示了一系列SQUID阵列的技术集成、器件设计以及它们在4.2 K至65 mK下的特性。测量是在绝热消磁冰箱中进行的。作为一个应用场景，我们已经成功地将它们实现为工作在150 mK的光跃迁边缘传感器的读出电路，需要在磁锁环配置中实现低噪声和大带宽的读出。

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来源期刊

IEEE Transactions on Applied Superconductivity 工程技术-工程：电子与电气

CiteScore

3.50

自引率

33.30%

发文量

650

审稿时长

2.3 months

期刊介绍： IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.