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  • 陈宝骥,叶澍坤,徐永强,曹刚.集成滤波器结构的可调超导微波谐振腔[J].低温物理学报,2022,(6):396-402.    [点击复制]
  • CHEN Baoji,YE Shukun,XU Yongqiang,CAO Gang.Tunable Superconducting Microwave Cavity with Integrated Filter[J].LOW TEMPERATURE PHYSICAL LETTERS,2022,(6):396-402.   [点击复制]
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集成滤波器结构的可调超导微波谐振腔
陈宝骥, 叶澍坤, 徐永强, 曹刚
0
(中国科学技术大学, 中科院量子信息重点实验室, 合肥 230026)
摘要:
在超导微波谐振腔耦合量子比特的杂化器件中, 可利用超导材料动态电感随直流电流变化的特性, 调节谐振腔的频率, 进而匹配量子比特的频率. 为抑制引入直流偏置电极导致的微波信号泄漏, 在可调腔中加入滤波器是一种有效的方案. 本研究以滤波器为切入点, 运用计算机模拟, 开发了原有“王”字型滤波器新的工作模式, 并在实验上制作了可调超导微波谐振腔. 测试结果表明, 谐振腔的品质因子可达7800, 阻抗约1700 欧姆, 谐振腔的频率可随直流电流发生明显变化, 最大变化量可达26 MHz.
关键词:  量子计算, 滤波器, 可调谐振腔, 动态电感
DOI:
基金项目:
Tunable Superconducting Microwave Cavity with Integrated Filter
CHEN Baoji, YE Shukun, XU Yongqiang, CAO Gang
(Key Lab of Quantum Information , CAS , University of Science and Technology of China , Hefei 230026)
Abstract:
In the superconducting microwave cavity-qubit hybrid device the kinetic inductance of the superconducting material can be tuned with the DC current ? so that the frequency of the cavity can be adjusted and thus it can b€ better matched with the frequency of qubit, in order to suppress the leakage of microwave signals while introducing DC-bias electrode, it is an effective solution to add filters on the tunable cavity. This research takes the filter as the starting point and uses computer simulation to develop a new working mode of the original Double-" E **-shaped filter. On this basis, a tunable superconducting microwave cavity was fabricated. The experimental results show that the quality factor of the cavity is ~ 7800 with the impedance ~ 1700 ohm. The frequency of the resonator can be tuned with the DC'-bias currents and the maximum change value is ~26 MHz.
Key words:  Quantum computing, Filter, Tunable cavity, Kinetic inductance

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