Measurement of Specific Capacitance for Nb/Al–AlO $_{x}$/Nb Josephson Junctions in Single-Flux Quantum Circuit Applications
Measurement of Specific Capacitance for Nb/Al–AlO $_{x}$/Nb Josephson Junctions in Single-Flux Quantum Circuit Applications
复制标题
单通量量子电路应用中 Nb/Al–Al2O $_{x}$/Nb 约瑟夫森结比电容的测量
DOI:
10.1109/tasc.2018.2812737
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发表时间:
2018
影响因子:
1.8
通讯作者:
Zhen Wang
中科院分区:
文献类型:
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作者:
Wei Xiong;Wanning Xu;Yu Wu;Guanqun Li;Liliang Ying;W. Peng;Jie Ren;Zhen Wang
In this study, we investigate different technologies to measure the specific capacitances <inline-formula> <tex-math notation="LaTeX">$C_{s}$</tex-math></inline-formula> of Nb/Al–AlO<inline-formula> <tex-math notation="LaTeX">$_{x}$</tex-math></inline-formula>/Nb Josephson junctions. They involve measuring Fiske mode resonance in long Josephson junctions, superconducting quantum interference device (SQUID) resonance, and Josephson plasma resonance. We find a logarithmic relationship between the junction <inline-formula> <tex-math notation="LaTeX">$C_{s}$</tex-math></inline-formula> and its critical current density <inline-formula> <tex-math notation="LaTeX">$J_{c}$</tex-math></inline-formula> in the range <inline-formula><tex-math notation="LaTeX"> ${\text{0.1}}\hbox{--}{\text{2\,kA/cm}}^{2}$</tex-math></inline-formula> using the Fiske mode resonance method. Our measured <inline-formula><tex-math notation="LaTeX">$C_{s}$</tex-math></inline-formula> values using SQUID resonance and Josephson plasma resonance are compared with the results obtained by other groups via analyzing the major errors in the <inline-formula><tex-math notation="LaTeX">$C_{s}$</tex-math></inline-formula> calculation. We discuss the accuracy in evaluating <inline-formula><tex-math notation="LaTeX">$C_{s}$</tex-math></inline-formula> for all three techniques and suggest using Fiske mode resonance as a relatively stable method for <inline-formula> <tex-math notation="LaTeX">$C_{s}$</tex-math></inline-formula> extraction for the future design of our single-flux quantum circuit.
DOI:
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发表时间:
2005
期刊:
IEEE TRANSACTIONS ON Applied Superconductivity 15
影响因子:
--
作者:
Shin'ichi Morohashi;Shin'ichi Morohashi;Shin'ichi Morohashi;Shin'ichi Morohashi;Shin'ichi Morohashi;Shin'ichi Morohashi
通讯作者:
Shin'ichi Morohashi
DOI:
--
发表时间:
2022
期刊:
影响因子:
--
作者:
田中 雅光;山下 太郎;藤巻 朗;牧瀬 圭正;永沢 秀一;日高 睦夫
通讯作者:
日高 睦夫