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The quantum-dot cellular automata computing paradigm shows particular promise in terms of density and power and also enabling a new approach to implement reversible computing. In this paper, we explore the efficient designs of various latches based on reversible logic for quantum-dot cellular automata building blocks, while applying the cell placement constraints introduced by the use of wave clock. Compared to previous literature, the proposed solutions show smaller cell count while using a potentially implementable clocking scheme for molecular QCA wave clocking. The functional correctness of the proposed latches are presented and verified using QCADesigner and HDLQ. Furthermore, we present detailed characterization and analysis, considering different cost metrics of the proposed latches. It is shown that, compared to previous literature, critical paths are decreased by 50%, 33%, 50%, 25% respectively for D-Latch, T-Latch, JK-Latch, and SR latch. There is also an improvement in timing is about 50% for D-Latch and JK-Latch, and 25% for SR-Latch.

Quantum-dot Cellular Automata Latches for Reversible Logic Using Wave Clocking Scheme