A review on reversible logic gates and their implementation

The document provides an overview of reversible logic gates and their implementation. It discusses how reversible logic gates can reduce power dissipation compared to irreversible logic gates. Some key reversible logic gates are described, including NOT, CNOT, Feynman, Toffoli, and Fredkin gates. Their truth tables and quantum costs are given. The document serves to introduce researchers to reversible logic gates that can be used to design more complex computing circuits with potential applications in quantum computing and low-power electronics.