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Experimental demonstration of radio frequency quantum-dot cellular automata devices.

机译：射频量子点细胞自动机设备的实验演示。

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摘要

Over the past four decades the transistor-based microelectronics industry has developed dramatically. As transistor size approaches nanometer range, many problems such as device interconnection, power dissipation and short-channel effects become increasingly hard to overcome and degrade device performance. A new computation paradigm named Quantum-dot Cellular Automata (QCA) provides a possible solution for transistor-less circuitry design and computation at the nanometer scale. In a QCA structure, binary information is encoded by the bi-stable charge configuration within quantum-dot cells, and neighboring cells are coupled by the Coulomb interaction. No current flows within the cells. Functional QCA logic devices such as binary wires, majority gates, shift registers and fan-outs have been demonstrated in metal-dot systems at dilution refrigerator temperatures (100 mK). However, the switching speed was on the order of seconds. This dissertation is focusing on investigating the time evolution of the binary state in QCA logic devices, as well as experimentally verification of the high-speed capabilities of clocked QCA devices.;In order to detect the switching activity within the QCA devices, the QCA dots are capacitively coupled to the island of a radio frequency single-electron transistor (RF-SET), which provides sub-electron charge sensitivity and radio frequency response. We investigate two kinds of RF-SETs, whose islands are featured by single-walled carbon nanotube (SWNT) and aluminum dot. The reflectometry measurement setup is explained. The performance and issues are discussed.;In this work, experimental demonstration of real-time electron switching is realized in a clocked aluminum-based electronic QCA device. The measurement is done in a 3He cryogenic system at elevated (compared to dilution refrigerator) temperatures. The operation speed has been improved up to micro-seconds. With the switching speed becoming faster, decrease in the error rate is demonstrated in the short-term QCA memory device. The technique presented here can serve as a prototype to explore an experimental solution for studying the intrinsic switching speed in a QCA.
机译：在过去的四十年中，基于晶体管的微电子行业发展迅速。随着晶体管尺寸接近纳米范围，诸如器件互连，功耗和短沟道效应之类的许多问题变得越来越难以克服并降低器件性能。一种名为量子点元胞自动机（QCA）的新计算范例为纳米级的无晶体管电路设计和计算提供了可能的解决方案。在QCA结构中，二进制信息由量子点单元内的双稳态电荷配置编码，相邻单元通过库仑相互作用耦合。单元内无电流流动。在稀释冰箱温度（<100 mK）的金属点系统中，已经证明了功能QCA逻辑设备（例如，二进制线，多数门，移位寄存器和扇出）。但是，切换速度约为秒。本文主要研究QCA逻辑器件中二进制状态的时间演化，并通过实验验证时钟QCA器件的高速性能。为了检测QCA器件内的开关活动，QCA点电容与射频单电子晶体管（RF-SET）的岛电容耦合，后者提供亚电子电荷敏感性和射频响应。我们研究了两种RF-SET，它们的岛具有单壁碳纳米管（SWNT）和铝点的特征。解释了反射测量的设置。讨论了性能和问题。在这项工作中，在钟控铝基电子QCA器件中实现了实时电子开关的实验演示。测量是在3He低温系统中，在升高的温度下（与稀释冰箱相比）进行的。操作速度已提高到微秒。随着切换速度变得更快，在短期QCA存储设备中证明了错误率的降低。本文介绍的技术可以作为原型，探索用于研究QCA中固有开关速度的实验解决方案。

著录项

  • 作者

    Tang, Yong.;

  • 作者单位

    University of Notre Dame.;

  • 授予单位 University of Notre Dame.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 197 p.
  • 总页数 197
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:18

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