Design of Hybrid Adder-Subtractor (HAS) using Reversible Logic Gates in QCA

Abstract

Quantum computers for the efficient simulation of physical systems are emerging today. Effect of Spin on Quantum Dots (QDs) paved the way for QCA. Quantum-dot cellular automata (QCA) have a simple cell as the basic element. The cell is used as a building block to construct gates and wires.Reversible logic has extensive applications in quantum Computing. Reversible logic is widely being considered as the potential logic design style for implementation in modern nanotechnology and quantum computing with minimal impact on physical entropy. Reversible gates such as Fredkin and DKG gates can be of great use for the implementation of the logic designs. Recent advances in reversible logic allow for improved quantum computer algorithms and schemes for corresponding computer architectures.In this paper, a design constructing the hybrid adder -Subtractor based on reversible logic gates as logic components using QCA is proposed. By using reversible logic gates instead of using traditional logic gates such as AND, OR, XOR, NOT, a Hybrid reversible Adder -Subtractor whose function is the same as the traditional Adder and Subtractor are designed and compared with the functioning of DKG gate based adder-subtractor. The simulation results shows that higher speed, smaller size and lower power consumption can be achieved with the proposed HAS system. GeneralTermDesign

Designing a one-bit coplanar QCA ALU using a novel robust area-efficient three-input majority gate design

“…QCA technology has some serious problems which are not already fixed completely due to its novelty. There are some defects in the chemical synthesis and deposition phases of QCA circuit design which decrease the reliability of these circuits [8,9]. Cell misalignment, cellular displacement, cell omission, and deposition of extra cells are the four most probable defects that would occur in the deposition phase resulting in a drastic reduction in circuit efficiency.…”

An efficient design of adder/subtractor circuit using quantum dot cellular automata

“…In existing [10], we can see two types of adder/subtractor. To make a simple adder/subtractor they use more cells and for that reason area become also very high.…”