Reversible logic is gaining increasing significance in diverse research areas, including quantum computing, nanotechnology, and optical computing. The exploration of reversible gates has emerged as a cutting-edge research area, driving a wave of innovative developments aimed at maximizing resource efficiency. This work focused on creating highly efficient 2-bit, 8-bit, and 64-bit comparators, leveraging the advantages of reversible logic gates. The results obtained from the comparative analysis demonstrate substantial improvements in energy efficiency and computational speed compared to other architectures. The proposed design demonstrated superior performance with reduced quantum cost and delay while minimizing garbage outputs. Specifically, the quantum costs of the 2-bit, 8-bit, and 64-bit comparators were measured to be 20, 128, and 1136, respectively. These outcomes suggest substantial enhancements in a variety of parameters, which ultimately will result in a more efficient and effective design. The functionality of the designed comparator tree was validated using Xilinx Vivado 2022.2 and implemented in Verilog HDL.
Reversible logic is gaining increasing significance in diverse research areas, including quantum computing, nanotechnology, and optical computing. The exploration of reversible gates has emerged as a cutting-edge research area, driving a wave of innovative developments aimed at maximizing resource efficiency. This work focused on creating highly efficient 2-bit, 8-bit, and 64-bit comparators, leveraging the advantages of reversible logic gates. The results obtained from the comparative analysis demonstrate substantial improvements in energy efficiency and computational speed compared to other architectures. The proposed design demonstrated superior performance with reduced quantum cost and delay while minimizing garbage outputs. Specifically, the quantum costs of the 2-bit, 8-bit, and 64-bit comparators were measured to be 20, 128, and 1136, respectively. These outcomes suggest substantial enhancements in a variety of parameters, which ultimately will result in a more efficient and effective design. The functionality of the designed comparator tree was validated using Xilinx Vivado 2022.2 and implemented in Verilog HDL.
Reversible logic gates are essential for quantum computing and low-power digital circuits as they enable the recovery of input signals from output signals, thereby minimizing energy dissipation. This field of study has become a leading-edge research domain, driving innovative advancements focused on optimizing resource efficiency. This study introduces an efficient 8-bit adder/subtractor circuit designed using Feynman and HNG reversible logic gates. The circuit incorporates a control bit (M) that dictates its operational mode: M=0 signifies addition functionality, while M=1 indicates subtraction functionality. This dual functionality is achieved with substantial efficiency enhancements, as evidenced by a 22% decrease in quantum cost compared to traditional methods. The design also boasts a reduced total reversible logic implementation cost, underscoring its efficiency. Validation and simulation of the reversible 8-bit adder/subtractor circuit are conducted using Xilinx Vivado 2022.2 software
Reversible computing has emerged as a promising solution for reducing energy dissipation in digital systems by addressing the fundamental limitations caused by information loss.Quaternary reversible logic, which uses multi-valued representations, provides higher information density, reduced interconnect complexity, and better scalability when compared to conventional binary logic.This work presents the design and implementation of a quaternary reversible Arithmetic Logic Unit (ALU) that integrates essential computational modules, including arithmetic units, logical units, memory units, decoders, and multiplexers.The proposed architecture supports efficient data routing and precise operation control through a scalable control unit and a selection-line-based design approach.The designed ALU demonstrates reduced quantum cost, fewer garbage outputs, and minimized constant inputs in comparison with existing reversible ALU designs, while remaining compatible with larger reversible and quantum computing architectures.Simulation results and comparative analysis validate the improved efficiency and low-power potential of the proposed system, making it suitable for next-generation computing applications.The complete design is implemented using Verilog HDL and synthesized and simulated using Xilinx Vivado Design Suite 2025.
In the context of modern Very Large-Scale Integration (VLSI) technology, information loss has been a major concern. Logic gates (LG) such as AND, OR, and NOT have been found to result in information loss during their operations. To address this issue, reversible LGs have been created. The development and implementation of a high-speed, efficient full adder circuit employing reversible LGs like Feynman, Toffoli, and Peres gates. The design aims to improve computational and thermal efficiencies. The circuit refarding quantum costs (QC), garbage outputs, and ancillary inputs. The implemented the suggested design in Verilog and verified the entire adder's functionality and efficiency through simulations using the Xilinx Vivado and Xilinx ISE tools. The circuit has a quantum cost of 10 with two outputs of useless and one auxiliary input, according to the researchers, highlighting its opportunities for usage in quantum computing applications andlow-power (dec 84%), high-performance computing systems.
Reversible logic is now employed in low-power CMOS circuits, optical data processing, DNA calculations, biological studies, quantum circuits, and nanotechnology.When building quantum computers, for example, the use of reversible logic is unavoidable.The structure of a reversible logic circuit is far more complex than that of an irreversible logic circuit.The multiplication operation is regarded as one of the most crucial in the ALU unit.In this paper, the Wallace tree method is utilized to minimize the depth of circuits in 8x 8 reversible unsigned multiplier circuits.The proposed design is an attempt to enhance design factors including the number of gates, garbage outputs, constant inputs, and quantum cost for an 8-bit Wallace Tree multiplier using reversible logic.The Proposed design offers 27% less quantum cost compared to the existing 8-bit Wallace tree multiplier design.
Reversible logic provides a foundation for nextgeneration computing systems, particularly in quantum and emerging nanotechnology-based architectures. Unlike conventional logic, reversible gates preserve information and support backward computation, making them crucial for designing quantum circuits. This paper introduces a reversible Arithmetic and Logic Unit (ALU) that performs eight fundamental operations-AND, OR, NOT, XOR, addition, subtraction, increment, and decrement-using Fredkin, Peres, TR, and modified Fredkin gates. A dedicated control unit manages operation selection, ensuring functional flexibility and circuit efficiency. The proposed design achieves significant improvements by minimizing ancilla inputs, quantum cost and garbage outputs, resulting in a total quantum cost of 71 and contains 16 reversible gates and 14 garbage outputs. The architecture was modeled and verified using Xilinx Vivado HLS and ISE 14.7, and implemented on the Nexys A7 (Artix-7) FPGA platform. Comparative analysis demonstrates better efficiency than existing reversible ALU designs, establishing the proposed circuit as a strong candidate for quantum computing and other advanced computing paradigms.
In modern Very-Large-Scale Integration (VLSI) technology, managing information loss is a critical challenge. Conventional logic gates, such as AND, OR, and NOT, are prone to data loss during operations, reducing their efficiency for sophisticated applications. Reversible logic gates, which have an equal number of inputs and outputs, offer a solution by preserving data integrity. This paper presents the design and FPGA implementation of an efficient and high-speed full adder circuit utilizing reversible logic gates, namely Feynman, Toffoli, and Peres gates. The design focuses on improving computational efficiency and thermal performance. An analysis of the circuit's quantum cost, garbage outputs, and ancillary inputs reveals its advantages over traditional designs. Proposed design has been realized using Verilog and Synthesize and simulations performed using Xilinx Vivado and Xilinx ISE tools, confirms the functionality and efficiency of the proposed full adder. FPGA implementation of the design has been done using NEXYS A7 (Artix 7 series). The results show that the circuit has a quantum cost of 10, with two garbage outputs and one ancillary input, underscoring its potential for use in low-power, high-performance computing systems and quantum computing applications.