两点量子元胞自动机逻辑电路设计与仿真

Design and Simulation of the 2-Dot Quantum-Dot Cellular Automata Logic Circuit

择多逻辑门和反相器是量子元胞自动机(QCA)逻辑电路的基本组件。设计了两点量子元胞自动机(两点QCA)的传输线、择多逻辑门和反相器等基本逻辑器件。通过仅在信号沿竖直方向传递需要取反时用到水平放置元胞的设计,使电路布局更加紧凑。利用这些基本逻辑器件完成了一位数值比较器电路的设计。基于两点QCA系统的半经典模型,利用遗传模拟退火法对电路功能进行了仿真。仿真结果显示,两点QCA同样能够有效实现传统四点QCA的功能,而其所需的电子数和量子点数均减少了32.1%,电路集成度提高了49.4%。

The majority gate and inverter are basic components of the quantum-dot cellular au- tomata （QCA） logic circuit. Usually, any functional logic circuits can be implemented by using the majority gate and inverter. Therefore, some basic logic devices, such as the binary wire, ma- jority gate and inverter were designed for the 2-dot QCA. The horizontal cell is just used when the signal passing in the vertical direction need to be inverted. Such a design makes the layout of the circuit more compact. A logic circuit of 1-bit comparator was designed with these basic logic devices. The simulation for the circuit function was achieved through the genetic simulated annea- ling method based on the semiclassical model of the 2-dot QCA. The simulation results indicate that the 2-dot QCA is capable of realizing the function of the traditional 4-dot QCA. Compared with the traditional 4-dot QCA, the amounts of electrons and quantum dots required for the 2-dot QCA reduce by 32.1%, and the integration increases by 49.4%.