Design of universal logic gate targeting minimum wire-crossings in QCA logic circuit

Wire crossings limit the performance of a logic circuit in Quantum-Dot Cellular Automata (QCA) based design. Minimization of wire-crossings is, therefore, of prime importance in the current nanotechnology, susceptible to high error rates. This work proposes a QCA (Quantum-Dot Cellular Automata) logic gate (UQCALG) realizing the universal functions. The design of UQCALG is based on the coupled Majority Minority (CMVMIN) QCA structure with the target to reduce wire crossings as well as the number of clock cycles required to operate a QCA circuit. The experimental designs establish that the UQCALG can lead to the cost effective design of QCA logic circuits that may not be possible with conventional ULG (Universal Logic Gate).