关键词: SQUID, 超导量子信号, 约瑟夫森结, 单片机, 低噪声放大器

Abstract: 1.College of Science, Northeastern University, Shenyang 110819, China; 
2. College of Information Science and Engineering, Northeastern University, Shenyang 110819, China)
Abstract:To meet the current requirements of lownoise, high precision, and high sensitivity measurements in SQUID quantum experiments, in this paper a SQUID experimental data measurement system is presented based on a singlechip STM32H750 core board and an AD8429 amplifier. By processing and analyzing the experimental curve obtained from the singlechip, the RMS noise value of superconducting quantum signal is determined to be 2.009 μV, which is close to the theoretical limit noise value. Additionally, the interference effect curve of the ringshaped liquid droplet Josephson junction is also measured by the system, in which periodicity is regular and uniform, and peaktopeak values are approximately consistent. The experimental results show that the system exhibits excellent stability and accuracy, which may lay the foundation for the development of university physics SQUID demonstration instruments.

Key words: SQUID, superconducting quantum signal, Josephson junction, single-chip, low-noise amplifier.