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Updated: Feb 14, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
A dual-function superconducting shield for SQUID (superconducting quantum interference device) gradiometers
Guangxin Han1, Kaiyuan Song1, Yuntao Qiu1
1National Gravitation Laboratory, MOE Key Laboratory of Fundamental Physical Quantities Measurement, and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Abstract:
In this work, we design and experimentally validate a novel dual-function superconducting shield that protects the Superconducting Quantum Interference Devices (SQUIDs) from external magnetic interference through superconducting shielding, while allowing compensation of pickup-coil imbalance by finely adjusting its axial displacement. A prototype low-temperature SQUID gradiometer with a 150 mm baseline and a 105 mm2 coil area was fabricated and tested. Intrinsic noise measurements indicate a noise level of ∼50 fT/m/√Hz at 0.1-1 Hz, while dynamic tests on a moving platform confirm stable operation under strong magnetic disturbances. The dual-function shield provides a practical solution that enhances the stability and reliability of wire-wound SQUID gradiometers for practical applications.
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