Efficient Approaches for Designing Quantum Costs of Various Reversible Gates

Over the last few decades, research in reversible logic has increasingly become very popular and it is gaining greater momentum in the present word. Reversible logic has started finding concert applications in quantum computing, optical computing, nano-technology based system, low-power CMOS design, VLSI design. The principal objective of this work is to argue for quantum implementation of various reversible logic gates by using CNOT, Controlled-V and Controlled-V+ gates. The present work presents parallel adder/subtractor (with over flow detection), as well as Binary coded decimal adder (BCD) in terms of number of gates, garbage outputs, quantum cost, delay and hardware complexity compared to existing design.