ABSTRACT
This chapter provides a comparison of different technologies in the field of digital data storage. It discusses some of the important elements of quantum-dot cellular automata (QCA) digital data storage from the viewpoint of design, simulation, and the contributing factors such as latency, area, access time. Quantum-dots are semiconductors or conductors in nanosize. One of the interesting applications of QCA is in developing high-density memories. The interesting point is that the QCA generally operates near the ground state, thus the master equation is tractable considering just a few states. In magnetic QCA, the logical states are shown through magnetic polarization of single magnetic dots. The chapter presents a new approach to implementation of quantum cryptographic modules via QCA technology. Nanotechnology emerges to bring new digital media with high capacity and high performance, where digital data are stored at nanoscale.
