Abstract
There has been remarkable research carried out on Nano-electronics where Quantum dot Cellular automata emerge as the forthcoming paradigm in computing. The QCA-based circuits are used in the computational Nano hardware to present computations at ultra-high speed. A systematic approach has been utilized to design the Serial in Serial out Shift (SISO) Register using JK flip flop (JK-FF) and D flip flop (D-FF). These flip flops were initially designed with lower complexity which is the dominant factor for designing any complex sequential circuit. The QCA based designs have been validated and subjected to simulation using the QCA Designer tool ver. 2.0.3.