Reversible Multiplexer Design in Quantum-Dot Cellular Automata

Quantum-dot Cellular Automata (QCA) is one of the emerging nanotechnologies which has been considered as a candidate platform to implement reversible circuits. In this paper at first a novel conservative reversible gate is introduced. Using this element, a 2:1 reversible multiplexer can easily be realized. Also is shown that this 2:1 design can be used to realize reversible multiplexers with different sizes (e.g., a 4:1 design). In all of the proposed designs the QCA clocking rules for constructing a robust QCA circuit against sneak noise paths have been considered and simulations have been performed using both bi-stable and coherence vector simulation engines of QCAdesigner which specify the accuracy of the proposed structures. Also these results demonstrate that the new QCA based design leads to significant improvements in terms of number of majority gates, area and complexity (cell count) in comparison to its well known counterparts.