Study on a high-precision current multiplier applicable to the quantum current standard

适用于量子电流标准的高精度电流倍增器的研究

• 批准号: 21360040
• 负责人: SHIMADA Hiroshi
• 金额: $ 11.98万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21360040/
• 关键词: 量子電流標準; 微小ジョセフソン接合列; 微小ジョセフソン接合; 接合列; 量子電流ミラー; 電流整数倍器; 帯電効果; 電流標準

A small-current 10-time multiplier using one-dimensional arrays of small Al/Al2O3/Al Josephson junctions and based on the quantum-current-mirror effect have been fabricated and tested. It showed the expected 10-time current multiplication function. The accuracy of the multiplication, however, was not good. It was most likely due to the small coupling capacitance. In order to substantially improve the accuracy, a fabrication process of a large coupling capacitance between the arrays has been successfully installed. A 10-time current multiplier with strong coupling has been fabricated using the process. A strongly coupled quantum-current-mirror devices were also fabricated and tested, and the quantitative relationship between the strength of the coupling and accuracy of the current duplication has been obtained. In such devices current induction with 0 bias voltage on the secondary array has been observed for the first time. Moreover, novel reversal of the induced current was observed : the direction of the induced current was the same as the primary current(input current) while applied magnetic field was small and Cooper-pair tunneling was dominant, and it changed to the opposite direction when applied magnetic field was large and quasiparticle(or electron) tunneling was dominant.

使用一维Al/al2O3/Al Josephson连接的一维阵列的小电流乘数已经制造和测试。它显示了预期的10次电流乘法函数。但是，乘法的准确性不好。这很可能是由于小耦合电容。为了实质上提高精度，已经成功安装了阵列之间大型耦合电容的制造过程。使用该过程制造了具有强耦合的10次电流乘数。还制造和测试了强耦合的量子电流设备，并且已经获得了耦合强度与当前重复的准确性之间的定量关系。在此类设备中，首次观察到次级阵列上有0个偏置电压的电流诱导。此外，观察到了诱导电流的新型逆转：诱导电流的方向与施加的磁场时的主要电流（输入电流）相同，库珀对隧道较小，并且当施加的磁场很大，并且Quasiparticle（或电子）隧道占主导地位时，它更改为相反的方向。

项目成果

Current steps in a mesoscopic Josephson junction embedded in a Josephson junction network

嵌入约瑟夫森结网络中的介观约瑟夫森结的当前步骤

• 发表时间: 2012
• 作者: Srinivas Gandrothula,水柿義直;島田宏
• 通讯作者: 島田宏

The Quantum Current Mirror Based 10-Time Current Multiplier

基于量子电流镜的10倍电流倍增器

• 发表时间: 2011
• 作者: Srinivas Gandrothula;Yoshinao Mizugaki;Hiroshi Shimada
• 通讯作者: Hiroshi Shimada

本研究に関連した修士論文[電気通信大学大学院情報理工学研究科先進理工学専攻]

与本研究相关的硕士论文[电子通信大学信息科学与技术研究生院尖端科学与工程系]

微小ジョセフソン接合列間の電流誘引現象

微小约瑟夫森结阵列之间的电流吸引现象

• 发表时间: 2012
• 作者: 石田千尋;水柿義直;島田宏
• 通讯作者: 島田宏

Current Induction in Strongly Coupled Arrays of Small Josephson Junctions

小约瑟夫森结强耦合阵列中的电流感应

• 发表时间: 2011
• 作者: Hiroshi Shimada;Chihiro Ishida;Yoshinao Mizugaki
• 通讯作者: Yoshinao Mizugaki