| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2021: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2020: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Outline of Final Research Achievements |
This research aims to pursue logic circuits operating near the quantum mechanical limit by superconductor single-flux-quantum (SFQ) circuits, by which high-speed and low-energy operations are compatible. The study on high-speed operations revealed that complex SFQ circuits could achieve 50-GHz clock frequencies by the developed precise timing design techniques and more than 100 GHz by further optimization based on the current fabrication process. Evaluations of speedup by partially removing shunt resistors, junction scaling, and niobium nitride Josephson junctions were also conducted. The detailed investigation on low-energy operation showed the relationship between energy consumption and operating speed in lowered currents and/or voltages.
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