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Quantum-dot cellular automata (QCA) is one of the most promising emerging paradigms offered for substitution of ongoing MOSFET technology. In order to qualify the QCA technology, all the previously designed circuits, either combinational or sequential, have been redesigned using QCA cell interaction. In this way, adder circuits, which play the most significant role in the arithmetic structures, have been extensively explored. In this paper, in the first step, a new single-layer 7-input majority-not gate is presented. This gate can be easily converted to a 5- or 7-input majority gate to form diverse QCA circuits. The extensive energy dissipation and structural evaluations over the proposed 5-input majority gate and the best previously published ones prove its prominent performance. In the next step, this well-shaped gate is leveraged as a basilar structure for implementation of an ultra-high speed QCA full adder. With respect to the counterpart designs, our proposed one surpasses all the previously published full adders in different points of views such as computation speed and number of consumed cells. QCADesigner and QCAPro tools are used as popular simulation engines to authenticate the circuit functioning and to measure energy dissipation, respectively.

An Efficient Quantum-Dot Cellular Automata Full Adder Based on a New Convertible 7-Input Majority-Not Gate