澳大利亚物理学家已提出一种可逆逻辑门的简单光学模型,这种门不需要能量,因此对计算机工业有深远影响。原则上说,这种器件可在量子水平上工作,没有误差。也就是说,它是用单个光子代表1。逻辑门是所有计算机的基本构作单元,信号以各种方式组合,用以表示计算机内的0和1。如果逻辑门必须可逆,也就是当输入和输出倒转时给出相同的解答,这种门将非常有效,其原因是任何可逆物理过程都不消耗能量。目前计算机普遍使用的逻辑门是不可逆的。昆士兰大学的 G.J.Milburn 已提出可逆逻辑门的光学模型。由此制作的一种器件称为Fredkin 门,具有三根输入线和三根输出线。以前,R.Feynman 曾提出用两态量子系统实现 Australian physicists have proposed a simple optical model of reversible logic gates that do not require energy and therefore have a profound impact on the computer industry. In principle, the device works at the quantum level with no errors. That is, it represents 1 with a single photon. Logic gates are the basic building blocks for all computers. The signals are combined in various ways to represent 0’s and 1’s inside the computer. If the logic gate must be reversible, that is, the same solution is given when the input and output are reversed, the gate will be very effective because none of the reversible physical processes consume energy. At present, the logic gate commonly used in computers is irreversible. G. J. Milburn of the University of Queensland has proposed an optical model of reversible logic gates. One such device, called a Fredkin gate, has three input lines and three output lines. In the past, R.Feynman proposed the use of two-state quantum systems