Electric-Field Bit Write-In for Molecular Quantum-Dot Cellular Automata Circuits

Jackson Henry, Joseph Previti, E. Blair
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Abstract

Quantum-dot cellular automata (QCA)was conceptualized to provide low-power, high-speed, general-purpose computing in the post-CMOS era. Here, an elementary device, called a “cell” is a system of quantum dots and a few mobile charges. The configuration of charge on a cell encodes a binary state, and cells are networked locally using the electrostatic field. Layouts of QCA cells on a substrate provide non-von-Neumann circuits in which digital logic, interconnections, and memory are intermingled. QCA supports reversible, adiabatic computing for arbitrarily low levels of dissipation. Here, we focus on a molecular implementation of QCA and describe the promise this holds. This discussion includes an outline of an architecture for clocked molecular QCA circuits and some technical challenges remaining before molecular QCA computation may be realized. This work focuses on the challenge of using macroscopic devices to write-in bits to nanoscale QCA molecules. We use an electric field established between electrodes fabricated using standard, mature lithographic processes, and the field need not feature single-molecule specificity. An intercellular Hartree approximation is used to model the state of an $N-$ molecule circuit. Simulations of a method for providing bit inputs to clocked molecular circuits are shown.
分子量子点元胞自动机电路的电场位写入
量子点元胞自动机(QCA)的概念是在后cmos时代提供低功耗,高速,通用的计算。这里,一个叫做“细胞”的基本装置是由量子点和一些移动电荷组成的系统。细胞上的电荷结构编码了二进制状态,细胞利用静电场在局部联网。QCA单元在衬底上的布局提供了非非诺伊曼电路,其中数字逻辑,互连和存储器混合在一起。QCA支持可逆,绝热计算任意低水平的耗散。在这里,我们专注于QCA的分子实现,并描述了它的前景。本讨论包括一个分子时钟QCA电路的架构大纲,以及在分子QCA计算可能实现之前存在的一些技术挑战。这项工作的重点是使用宏观设备将比特写入纳米级QCA分子的挑战。我们使用标准的、成熟的光刻工艺制造的电极之间建立的电场,并且电场不需要具有单分子特异性。细胞间哈特里近似用于模拟N-$分子电路的状态。模拟一种方法提供位输入时钟分子电路显示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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