Precise Measurement of a 20-V Programmable Josephson Voltage Standard System
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概要
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We demonstrated the precise measurement of a 20-V programmable Josephson voltage standard (PJVS) system with an accuracy of $10^{-9}$. A 20-V PJVS chip including 524288 NbN/TiNx/NbN Josephson junctions (JJs) was used and operated in a cryocooler. By optimizing a microwave frequency, the widest current margin of a voltage step greater than 1 mA was obtained at 15.85 GHz. The maximum voltage of 17 V was also obtained at 18.00 GHz although we could not obtain voltages exceeding 20 V due to defective JJs. We also successfully compared the PJVS system with a 10-V Zener diode with an accuracy of $10^{-8}$.
- 2009-07-25
著者
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Yamamori Hirotake
National Institute Of Advanced Industrial Science And Technology
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Shoji Akira
National Institute Of Advanced Industrial Science And Technology
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SASAKI Hitoshi
National Institute of Advanced Industrial Science and Technology
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YAMADA Takahiro
National Institute of Advanced Industrial Science and Technology (AIST)
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Shoji Akira
National Institute of Advanced Industrial Science and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Sasaki Hitoshi
National Institute of Advanced Industrial Science and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Yamamori Hirotake
National Institute of Advanced Industrial Science and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Yamada Takahiro
National Institute of Advanced Industrial Science and Technology, Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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