针对量子元胞自动机(QCA)电路中电路单元复杂化能提高电路可靠性的假设,采用概率转移矩阵对一种改进后的QCA共面交叉电路单元及原始电路单元的可靠性进行对比分析,以检验复杂化设计能否提高电路可靠性,并利用四选一数据选择器进行深入研究以验证分析结果。仿真结果表明,该改进方案将共面交叉电路单元应用于单独运行及组合电路中分别使电路的可靠性降低了19.6%和0.84%。改进后的电路单元不但没有提高可靠性,反而由于电路结构的复杂化降低了其可靠性。 Aiming at the assumption that the complexity of circuit elements in quantum cellular automata (QCA) circuit can improve the circuit reliability, a probability transfer matrix is ​​used to compare the reliability of an improved QCA coplanar circuit unit and the original circuit unit. To test the complexity of the design can improve the circuit reliability, and the use of four to choose a data selector for further study to verify the analysis results. The simulation results show that the improved scheme reduces the circuit reliability by 19.6% and 0.84% ​​respectively when the coplanar units are used in single operation and in combination circuits. The improved circuit unit not only failed to improve the reliability, but due to the complexity of the circuit structure to reduce its reliability.