Chapter Abstract:
Summary This chapter introduces quantum dot cellular automata (QCA) technology as an alternative to complementary metal–oxide–semiconductor (CMOS) technology in digital c...Show MoreMetadata
Chapter Abstract:
Summary
This chapter introduces quantum dot cellular automata (QCA) technology as an alternative to complementary metal–oxide–semiconductor (CMOS) technology in digital circuit design. QCA is known for its ability to design circuits with nanodimensions, high computing speed, low power consumption, and high circuit density. This chapter discusses the advantages of multi‐valued logic in QCA, which allows each bit to have more than one value, enabling the processing of more information and reducing costs. It further explains the concept of binary QCA cells, their structure, and stable polarization states. Ternary QCA cells, which have four stable states based on the number of electrons and wells, are also introduced. The role of clocks in QCA cells is described as controlling the movement of electrons and ensuring synchronization in the circuit. This chapter explores different methods of implementing QCA, including metal island, semiconductor, molecular, and magnetic methods, highlighting their advantages and challenges. It also provides an overview of quantum gates in QCA, such as quantum wires and their structures, including 90° and 45° alignments. Methods for passing wires over each other in complex QCA circuits are discussed, including overlapping, multilayer, and clock‐based approaches.
Page(s): 23 - 31
Copyright Year: 2024
Edition: 1
ISBN Information: