Reversible priority encoder design and implementation using quantum-dot cellular automata

Quantum-dot cellular automata (QCA) are the potential alternative to complementary metal-oxide-semiconductor-based technology. Ideally, zero power dissipation can be achieved with the help of reversible computing. In this study, a novel design of a reversible priority encoder based on QCA is proposed. The basic building blocks for the design are Toffoli and BJN gates. The proposed design is verified by the QCA designer simulator. The performance analysis of the reversible priority encoder is performed based on the simulation results. The proposed encoder not only overcomes the problem of the messy code but also declines the amount of heat energy dissipation through reversible logic. The proposed reversible circuit could be a major component in future wireless communication because reversible logic accounts for zero loss of information. The estimation of power consumption by proposed QCA circuits is explored that implies QCA can be an ideal platform to implement reversible circuits. The relationship with recently proposed work is also discussed.