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.

量子点元胞自动机计算范式在密度和功率方面表现出特别的前景，并且还支持实现可逆计算的新方法。在本文中，我们探索了基于量子点元胞自动机构建块的可逆逻辑的各种锁存器的高效设计，同时应用了使用波时钟引入的单元放置约束。与以前的文献相比，所提出的解决方案在使用分子 QCA 波时钟的潜在可实施时钟方案时显示出更小的细胞数。使用 QCADesigner 和 HDLQ 展示并验证了建议的锁存器的功能正确性。此外，考虑到所提出的锁存器的不同成本指标，我们提供了详细的特性描述和分析。表明，与以往文献相比，D-Latch、T-Latch、JK-Latch 和 SR latch 的关键路径分别减少了 50%、33%、50%、25%。D-Latch 和 JK-Latch 的时序也有改进，大约是 50%，SR-Latch 是 25%。