Fluxonic元胞自动机
Fluxonic Cellular Automata
摘要：
我们制定了一个新的概念计算与量子元胞自动机组成的纳米结构的超导器件阵列。逻辑状态由蚀刻在介观超导正方形上的2x2盲孔矩阵中的两个捕获的通量量子（涡旋）的位置定义。这种小的计算单位单元完全在当前制造技术的范围内。在单胞阵列中，一个单胞的涡旋位形通过屏蔽电流影响相邻单胞的穿透通量线。或者，在连体细胞中，信息传递可以通过相邻细胞中的超电流之间的相互作用来加强。在这里，我们提出了功能逻辑门的基础上，这种磁通元胞自动机（FCA），其中的逻辑操作进行验证，通过理论模拟的框架内的时间依赖的金-朗道理论。输入信号由放置在输入单元的两个对角盲孔顶部的电流回路定义。对于给定的电流极化，外部通量线被环吸引或排斥，形成“0”或“1”配置。读出技术可以从各种现代涡流成像方法、传输和LDOS测量中选择。
英文摘要：
We formulate a new concept for computing with quantum cellular automata composed of arrays of nanostructured superconducting devices. The logic states are defined by the position of two trapped flux quanta (vortices) in a 2x2 blind-hole-matrix etched on a mesoscopic superconducting square. Such small computational unit-cells are well within reach of current fabrication technology. In an array of unit-cells, the vortex configuration of one cell influences the penetrating flux lines in the neighboring cell through the screening currents. Alternatively, in conjoined cells, the information transfer can be strengthened by the interactions between the supercurrents in adjacent cells. Here we present the functioning logic gates based on this fluxonic cellular automata (FCA), where the logic operations are verified through theoretical simulations performed in the framework of the time-dependent Ginzburg-Landau theory. The input signals are defined by current loops placed on top of the two diagonal blind holes of the input cell. For given current-polarization, external flux lines are attracted or repelled by the loops, forming the '0' or '1' configuration. The read-out technology may be chosen from a large variety of modern vortex imaging methods, transport and LDOS measurements.
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