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This article describes the design of adder units on quantum-dot cellular automata (QCA) nanotechnology, which promises very dense circuits and high operating frequencies, using a single homogeneous layer of the basic cells. We construct pipelined structures without the earlier noise problems, avoided by careful clocking organization, and the modular layouts are verified with the QCADesigner coherence vector simulation. Our designs occupy only a fraction of area compared to the previous noisedoi:10.1007/s11265-008-0284-5 fatcat:3ro6hm3nynba5hrfsffjzaok7a