Single-electron devices are promising as nano-scaled device elements in future LSIs, because of their ultralow-power-consumption and small-size properties. However, it is not realistic to replace all the MOSFETs in present LSIs with single-electron devices, because the present CMOS technology is so mature and advanced that other technologies have very little chance to completely replace the CMOS technology. Therefore, it is essential for single-electron devices to have values, or functionalities, which CMOSFETs do not have, in order to take important role in future LSI systems. In this work, we propose 1) programmable logic, which have higher functionality than CMOS programmable logic, and 2) high-quality single-electron random-number generator, which provide high securities for communication systems. In addition, their operations are demonstrated at room temperature.
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