| Superconducting quantum interference devices with different damped junctions operated in directly coupled current-and voltage-bias modes |
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| 作者姓名： | 曾佳 张懿 邱阳 张国峰 王永良 孔祥燕 谢晓明 |
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| 作者单位： | State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences;Peter Grnberg Institute (PGI-8), Forschungszentrum Jlich (FZJ), D-52425 Jlich, Germany;Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration between CAS-Shanghai,Shanghai 200050,China and FZJ, D-52425 Jlich Germany;University of Chinese Academy of Sciences |
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| 基金项目： | Project supported by the Strategic Priority Research Program （B） of the Chinese Academy of Sciences （Grant No. XDB04010100） and One Hundred Person Project of the Chinese Academy of Sciences. |
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| 摘 要： | We investigate niobium thin film superconducting quantum interference devices （SQUIDs） with different Steward- McCumber parameters βc operated in both current- and voltage-bias modes. We experimentally prove that there is no difference between the two bias modes with respect to the SQUID intrinsic noise and the noise contribution from the preamplifier. Furthermore, the relationships of the SQUID dynamic parameters, （Rd）current bias ≈ （Rd）voltage bias and （σV/σФ）current bias ≈ σi/σФ）Rd]voltage bias, are always satisfied. For a strongly damped SQUID withβc ≈ 0.25, addi- tional positive feedback （APF） and noise cancellation （NC） were employed to enhance σV/σФ, the former showing a degradation in the linear flux range but otherwise the same with NC. For a weakly damped SQUID with βc ≈ 3, it is di- rectly connected to the preamplifier without APF or NC, and a low SQUID system noise of about 4μФ0/x/Hz is measured, which is close to its intrinsic noise.
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| 关 键 词： | 电压偏置 耦合电流 超导量子干涉器件 强阻尼 操作 超导量子干涉仪 前置放大器 路口 |
Superconducting quantum interference devices with different damped junctions operated in directly coupled current- and voltage-bias modes |
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| Affiliation: | [1]State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; [2]) Peter Grunberg Institute (PGI-8), Forschungszentrum Julich (FZJ), D-52425 Julich, Germany; [3]Joint Research Laboratory on Superconductivity and Bioelectronics, Collaboration between CAS-Shanghai, Shanghai 200050, China and FZJ, D-52425 Jalich Germany; [4]University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | SQUID, noise, bias mode, Steward-McCumber parameter |
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| Keywords: | SQUID noise bias mode Steward-McCumber parameter |
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