An Efficient Priority Encoder Design Utilizing Reversible Logic Techniques

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.