Abstract
The reversible logic and gates are one of the promising and upcoming technologies which are capable of overcoming the limitations of the design and applications based on the CMOS technology. In this technology, the schematic arrangement of the device is implemented in such a way that every input terminal has been provided with individual output terminals. The author has used the technology which is based on quantum computations with a basic feature of loss of energy in small amount. It has many advantages like very high operating speed, low energy dissipation, and high device density. An adder/subtractor is heart of arithmetic units of processors i.e. acts as universal circuit for carrying out the mathematical computations in the quantum processors. The author has put forward a novel reversible adder/subtractor circuit using reversible logic & QCA. The QCA based circuit reported by the author has been compared and analyzed for the performance on the basis of number of gates, size, delay, power dissipation etc. The experimental work has been completed with the use of the most suitable and reliable software i.e. QCA and the performance of the proposed circuit has proven to be quite useful for this circuit to be used in some promising applications. These results are also compared with those obtained with the use of CMOS Technologies.
Highlights
The concept of the reversible logic has developed a new era of the technology in support with another innovative concept based on the quantum i.e. the role of the photons in the performance of the systems
It has become quite feasible to implement a device with low power dissipation, small size, less delay, high speed, etc
One can eliminate the limitations which do exist by using irreversible logic approach i.e. the loss of information in terms of the heat dissipation
Summary
The concept of the reversible logic has developed a new era of the technology in support with another innovative concept based on the quantum i.e. the role of the photons in the performance of the systems. With this proposed circuit, emphasis has been made on reducing the no of cells i.e. high density in addition to other prime features This manuscript flow has been started with an introduction to the topic with some literature survey on the reversible logic & QCA, basics of the mathematical computation of the ALU, discussion of the proposed circuit and the last section delays with the performance analysis of the 3 bit universal circuit using reversible gate for the ALU of quantum processor. An exhaustive literature survey has been carried out by the author so as to choose the most efficient reversible gate in order to design and implement the proposed design of universal circuit for an ALU of the quantum processor Based on this discussion, it has been found that with the use of the RQG gate the resultant circuit can provide the desired performance as shown in below Figure 13 (a). It has been implemented with the use of the most commonly used software tool due to its distinct features and results
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