Description: Quantum reversible logic is a type of logic circuit that allows the recovery of input states from output states. This concept is based on the idea that logical operations can be designed in such a way that no information is lost during the computation process. In contrast to classical logic, where some operations are irreversible and can lead to information loss, reversible logic ensures that each output has a unique corresponding input. This is crucial in the context of quantum computing, where preserving information is vital due to the delicate nature of qubits. Quantum reversible logic uses logic gates that are intrinsically reversible, such as the Toffoli gate and the CNOT gate, which allow for the manipulation of qubits without losing information. This feature is essential for error correction in quantum systems but also contributes to energy efficiency in quantum circuits by minimizing energy dissipation. In summary, quantum reversible logic represents a significant advancement in computing, enabling the development of algorithms and systems that are more robust and efficient compared to their classical counterparts.