Abstract. While human progress in the world of electronics, computers and computing is undeniable, new researches show that we can achieve greater speed and lower power consumption based on the principles of quantum physics. Changing from the digital world of today, which is based on CMOS transistors and the electric current, to quantum with no electric current and based on magnetic flux, is now in the middle of its way. Clearly any research in this area or even a comprehensive scientific attention is laudable from the experts’ viewpoint. This paper tries to show quantum computers more tangible by describing and analyzing some basic principles and explaining the entrance to this technology. In this article it is explained how the spintronics, superconductivity, and Josephson junction open the ways to the next generation of faster, more compact, and more energy-efficient computers in future; computers that bring about several hundred times the speed and negligible power consumption, along with the revolution of basic principles of electronics. We'll see how the spin transistors transfer data in lower speed and volume, using the electron spin direction to be high or low, or how the superconductivity, which is the key to the future supercomputers, solve the problem of supercomputers power consumption using technologies such as RSFQ.