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Abstract: Quantum Dot Cellular Automata (QCA)is an alternative to CMOS technology. The other technologies proposed by researchers are FINFET, CNTs and MTJ to reduce scalability of CMOS devices. Using Quantum Dot Cellular Automata, the low power, extremely dense circuits are designed. QCA cell is the Urgent unit in building reasoning entryways. These cells are powered using unequivocal clock.QCA cells are used to design principal doorways and to recognize Boolean verbalizations. QCA Organizer instrument is used to finish diversions. The simulation results are same as speculative results. The complexity and size of circuits are diminished using QCA. The paper includes design of Programmable Logic Array(PLA).