- High-Tc superconductor (HTS) materials have the potential to revolutionize lownoise electronics, because superconductor electronics can be realized at relatively high temperatures. These temperatures might soon be achievable by solid-state cooling elements at the commercial level if both the HTS and the cooling element development continues at the current level. However, it should be kept in mind that this task might not compromise the requirements of low-noise. The real condition of success of HTS materials will always be the potentially low level of noise, because their high-speed semiconductor and nanoelectronics are strong competitors at convenient working temperatures. Due to the different physics of superconductors, their potentially achievable noise properties seem to be unbeatable. However, as far as HTS devices are concerned, although their noise properties are good, the same properties are achievable by semiconductor circuits also, but the circuits need a carefully designed circuitry. Therefore, understanding the source of noise and reducing the noise level in the HTS materials has a high priority in research.