Design and Analysis of Quantum Dot Cellular Automata Technology Based Reversible Multifunction Block

In the era of emerging trends quantum dot cellular automata has become very popular because of its extremely small size. In this paper logically reversible 4 x 4 block is proposed. This block is designed and simulated using Quantum Dot Cellular Automata technology. This QCA based 4 x 4 block named Reversible multifunction block is capable to generate different reversible functions like OR, AND, XOR, XNOR, Full Subtractor, Full Adder, Half Subtractor, Half Adder, code Converters like Gray to Binary and Binary to Gray, Pass Gate, Set, Reset and complement, by changing the inputs at different instants. Reversible Multifunction Block constituted of thirteen reversible functions. Performance analysis of this new design shows that using single block or single Gate, multiple functions can be generated whereas if we wish to design all these functions separately too many number of gates are required. This 4 x 4 reversible Multifunction Block is proved to be efficient in the literature. The proposed design is implemented using QCA-Designer 2.3.