论文信息 - Demonstration of a 10 V programmable Josephson voltage standard system based on a multi-chip technique

Demonstration of a 10 V programmable Josephson voltage standard system based on a multi-chip technique

We have demonstrated a programmable Josephson voltage standard (PJVS) operation up to 10.84 V using a multi-chip technique. We combined two PJVS chips fabricated using NbN/(TiNx/NbN)2 junction technology. Each PJVS chip was mounted on a single chip carrier using bonding wire, and the two chip carriers were connected by a simple Cu lead wire, and mounted on a cryocooler. High-precision measurements confirmed flat voltage steps for all 22 cells, with a peak-to-peak variation of 100 nV and wide margins of at least 0.35 mA. We also confirmed the stability of the voltage steps in spite of a temperature and RF frequency variation of ± 0.1 K and ± 0.1 GHz, respectively.

Hirotake Yamamori | Hitoshi Sasaki | Akira Shoji | T. Yamada

[1] Ralf Behr,et al. Improved 1 V programmable Josephson voltage standard using SINIS junctions , 2002 .

[2] A. Shoji,et al. Operation of a NbN-based programmable Josephson voltage standard chip with a compact refrigeration system , 2003 .

[3] J. Niemeyer,et al. Josephson voltage standard circuit operation with a pulse tube cooler , 2003 .

[4] C. Hamilton,et al. Josephson D/A converter with fundamental accuracy , 1995 .

[5] H. Sasaki,et al. Operating Margins of a 10 V Programmable Josephson Voltage Standard Circuit Using ${\rm NbN}/{\rm TiN}_{x}/{\rm NbN}/{\rm TiN}_{x}/{\rm NbN}$ Double-Junction Stacks , 2007, IEEE Transactions on Applied Superconductivity.

[6] Samuel P. Benz,et al. Stable 1 volt programmable voltage standard , 1997 .

[7] A. Shoji,et al. 10V programmable Josephson voltage standard circuits using NbN∕TiNx∕NbN∕TiNx∕NbN double-junction stacks , 2006 .

[8] P. Konsin,et al. Dependences of the chemical potential shift and superconducting transition temperature on the hole concentration in La2-xSrxCuO4 and Bi2Sr2Ca1-xYxCu2O8+delta , 2000 .

[9] Ralf Behr,et al. Design and fabrication of 10 V SINIS Josephson arrays for programmable voltage standards , 2000 .

[10] H. Yamamori,et al. Practical high-resolution programmable Josephson Voltage standards using double- and triple-stacked MoSi/sub 2/-barrier junctions , 2005, IEEE Transactions on Applied Superconductivity.