Reversible logic circuit design using QCA based modified Fredkin gate

Quantum-dot cellular automata (QCA) is presently considered for implementing ultra-large-scale integrated circuits. The design of different arithmetic and logical units using QCA is of high research interest in the current scenario. Apart from this, QCA has also found its application in the reversible domain. To the best of our knowledge various QCA based reversible circuits have already been reported in many works. But most of the works are mainly focused on designing the well-established reversible gates viz. Fredkin, Toffoli, Peres, etc. in QCA and making bigger circuits using these gates. The research reported in this literature deals with a completely new QCA layout of a reversible gate. This proposed gate is an updated version of Fredkin gate and named as modified Fredkin gate (MFG). We can implement 16 primitive logic operations using a single MFG unit. Apart from that, MFG is a quantum gate whose quantum realization is also shown in this literature. The proposed 4 x 4 MFG can configure the circuit of n-input XOR-XNOR and OR-AND gate.