| 含有两个约瑟夫森结的射频SQUID的本征磁通噪声 |
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| 引用本文： | 毛博,戴远东,王福仁.含有两个约瑟夫森结的射频SQUID的本征磁通噪声[J].中国物理 B,2005,14(2):301-305. |
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| 作者姓名： | 毛博 戴远东 王福仁 |
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| 作者单位： | State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China;State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China;State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China |
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| 基金项目： | Project supported by the Hi-Tech Research and Development Programme of China (Grant No 2002AA306412) and the Key Basic Research and Development Programme of China (Grant No G1999064609). |
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| 摘 要： | 我们研究了双结射频超导量子干涉器件（rf SQUID）的含时特性，给出了总磁通的动力学方程，并分析了在回滞模式和非回滞模式下的本征磁通噪声。结果显示：两个结的临界电流差别越大则越有助于获得小的本征噪声，在这种情况下，双结rf SQUID的本征磁通噪声会比单结rf SQUID的噪声稍大，但不超过一个数量级。
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| 关 键 词： | rf SQUID RCSJ模型 本征磁通噪声 回滞模式和非回滞模式 |
| 收稿时间： | 2004-07-12 |
| 修稿时间： | 8/9/2004 12:00:00 AM |
Intrinsic flux noise level of an rf SQUID involving two Josephson junctions connected in series |
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| Mao Bo,Dai Yuan-Dong and Wang Fu-Ren.Intrinsic flux noise level of an rf SQUID involving two Josephson junctions connected in series[J].Chinese Physics B,2005,14(2):301-305. |
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| Authors: | Mao Bo Dai Yuan-Dong and Wang Fu-Ren |
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| Institution: | State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China |
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| Abstract: | The time-dependent characteristics of a radio frequency superconducting quantum interference device (rf SQUID) involving two Josephson junctions connected in series are studied. First the dynamics of the total flux is given. Then the intrinsic flux noises in both nonhysteretic and hysteretic modes are investigated. The result shows that it is necessary to properly reduce the critical current ratio of the two junctions for low intrinsic noise level. When the critical current ratio is properly reduced, the intrinsic flux noise level of a two-junction rf SQUID is generally close to or slightly larger than that of a single junction rf SQUID, but no more than one order-of-magnitude. |
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| Keywords: | rf SQUID RCSJ model intrinsic flux noise hysteretic and nonhysteretic modes |
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