Abstract: Carry-Look Ahead adder is one of the essential components used in different digital logic circuits for its fast and efficient computation capability. This paper primarily focuses on the design and simulation of 4-bit CLA adders which are implemented using two different technological perspectives, the conventional CMOS technology using VHDL and Quantum Computing using Quantum-dot Cellular Automata (QCA). Both designs are based on reversible logic to reduce heat dissipation, better testing of faults in circuits, and nearly energy-free computation. VHDL has been the most effective hardware descriptive language when it comes to digital circuit designs but with the advancement of technology, implementation of circuits using QCA is considered an alternative approach. This research work will impart an in-depth comparison between the two domains of technology on one of the most useful combinational logic circuits, the CLA Adder.
Keywords: CLA Adder, Quantum Cellular Automata, VHDL, Reversible Logic Gates.
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