Reversible logic gates are recognized for their innate energy efficiency, as they do not waste energy through information loss during computations. They hold a pivotal role in quantum computing due to their bijective nature, which is essential for crafting quantum algorithms and circuits. Their resilience to faults makes reversible gates well-suited for constructing robust and dependable digital systems, particularly in critical safety applications. This project centers on crafting and executing a 4-to-2 priority encoder using reversible logic gates. A priority encoder is a type of circuit that allows several input lines to be converted into a binary code that is a reflection of the current input that is given the highest priority. The design incorporates three Feynman gates, two Toffoli gates, and a BJN gate, showcasing the effectiveness of reversible logic gates in creating efficient digital circuits. The design demonstrates superior performance in terms of quantum cost in comparison to other encoder architectures, with a decrease in quantum cost that is 33.3% lower than the other architectures.
Reversible logic gates are recognized for their innate energy efficiency, as they do not waste energy through information loss during computations. They hold a pivotal role in quantum computing due to their bijective nature, which is essential for crafting quantum algorithms and circuits. Their resilience to faults makes reversible gates well-suited for constructing robust and dependable digital systems, particularly in critical safety applications. This project centers on crafting and executing a 4-to-2 priority encoder using reversible logic gates. A priority encoder is a type of circuit that allows several input lines to be converted into a binary code that is a reflection of the current input that is given the highest priority. The design incorporates three Feynman gates, two Toffoli gates, and a BJN gate, showcasing the effectiveness of reversible logic gates in creating efficient digital circuits. The design demonstrates superior performance in terms of quantum cost in comparison to other encoder architectures, with a decrease in quantum cost that is 33.3% lower than the other architectures.
Reversible logic gates are critical components in the field of quantum computing and low-power digital circuits, as they allow for the retrieval of input states from output states without any loss of information. This property ensures minimal energy dissipation, aligning with the principles of reversible computation. Their applications extend to quantum computing, cryptographic systems, and error detection and correction mechanisms. This paper presents a novel design for a Reversible D Flip-Flop (RDFF) and a 4-bit Linear Feedback Shift Register (LFSR). The Linear Feedback Shift Register (LFSR) is built utilizing four Register-Driven D Flip-Flops (RDFFs) and a feedback mechanism that incorporates a Feynman Gate. This configuration successfully showcases the capacity to generate pseudo-random sequences. The LFSR design demonstrates a 10% improvement in Total Reversible Logic Implementation Cost and 27% enhancement in quantum cost, making it a more resource-efficient option for reversible computing. This work makes a valuable contribution to the field of reversible computing by offering efficient designs for essential components.
Ternary quantum logic plays a very important role for building high speed and efficient futuristic computers. It has several advantages over classical computing and binary quantum circuits. In this paper, the realization of basic ternary circuits for adder/subtractor, encoder and priority encoder are proposed and designed. These circuits are very essential for the construction of various computational units of quantum computers and other complex computational systems. Design of reversible circuits can be improved by reducing the quantum circuit cost. This paper uses some elementary components and typical ternary gates (generalized ternary gate, M-S gate etc.) to perform arithmetic addition, subtraction and encoding operations. Finally, it evaluates the optimum cost for each circuit.
In recent years, reversible logic circuits have applications in the emerging field of digital signal processing, optical information processing, quantum computing and nano technology. Reversibility plays an important role when computations with minimal energy dissipation are considered. The main purpose of designing reversible logic is to decrease the number of reversible gates, garbage outputs, constant inputs, quantum cost, area, power, delay and hardware complexity of the reversible circuits. This paper reveals a comparative review on various reversible logic gates. This paper provides some reversible logic gates, which can be used in designing more complex systems having reversible circuits and can execute more complicated operations using quantum computers. Future digital technology will use reversible logic gates in order to reduce the power consumption and propagation delay as it effectively provides negligible loss of information in the circuit. Keywords: Garbage output, Power dissipation, quantum cost, Reversible Gate, Reversible logic,
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
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 also called information lossless logic, since the information embedded in the circuits can be recovered, if lost. Research carried out by Landauer and Bennett proved that the energy dissipation would not occur if computation is made reversible. With this aim a number of reversible gates were designed and invented. As examples like- the Fredkin gate, the Toffoli gate, the Peres gate, and the Feynman gate. Reversible logic has extensive applications and is considered as one of the futuristic technologies. But the logic circuit designing is based on logic gates, which are non-reversible. This paper presents design of logic gates using reversible gates. These logic gates help in future implementation of higher end circuits. In this paper an attempt is made to design logic gates using reversible gates and some of the higher end circuits are also designed such as Binary-to-Grey, grey-to-Binary, Adder, Subtractor etc.