NIRT: Nanotube and Nanowire Based Quantum Computation

EIA-0210736 Watson，Susan KMiddlebury CollegeNIRT：基于纳米管和纳米线的量子计算一个团队已经组织起来，使用碳纳米管和硅纳米线作为衬底来实现简单的一维量子计算机，并围绕这一重点目标研究合成、纳米制造、理论物理和计算机科学等问题。拟议中的努力将集中在这种器件上，它由一维电荷孤岛--量子点--组成，量子点之间的耦合由栅极电压控制。这些点的本征磁矩(自旋)被用来形成量子计算机的量子比特(量子比特)。该方案的优点在于其简单性；与其他提出的方案相比，只需改变沿纳米管或纳米线的相邻量子点之间的耦合即可。该研究项目得到了一个教育项目的补充，该项目将来自几个学科的学生聚集在一起，鼓励他们作为单一集体努力的一部分，发展智力并进行互动。纳米科学与工程计划的教育目标将通过创建专注于纳米科学的课程和实验模块来明确地推进。该项目提出了一些基本的物理问题，涉及到这个简单的一维系统中的主动自旋操纵，以及超越近邻的耦合如何纠正量子退相干和时间误差的问题。如果该设备最终按预期运行，它将作为一台通用量子计算机发挥作用，这是目前许多研究的重点。

EIA-0210736Watson, Susan KMiddlebury CollegeNIRT: Nanotube and Nanowire Based Quantum ComputationA team research effort has been organized to implement a simple one-dimensional quantum computer using carbon nanotubes and Si nanowires as the substrate, and to in-vestigate issues of synthesis, nanofabrication, theoretical physics, and computer science surrounding this focused goal. The device on which the proposed effort will concentrate consists of a one-dimensional string of islands of charge-quantum dots-with coupling between the dots controlled by the application of gate voltages. The intrinsic magnetic moments ('spins') of the dots are used to form the quantum bits ('qubits') of a quantum computer. The strength of the scheme lies in its simplicity; in contrast to other proposed schemes, only changes to the coupling between neighboring quantum dots along the nanotube or nanowire are necessary. The research project is complemented by an educational program that brings to-gether students from several disciplines, encouraging them to develop intellectually and interact as part of a single collective effort. The educational goals of the Nanoscale Sci-ence and Engineering program will be explicitly advanced through the creation of courses and lab modules focused on nanoscience.A number of basic physics questions are raised by this project, relating to active spin manipulation in this simple 1D system and to the ways in which coupling beyond nearest neighbors can correct for problems of quantum decoherence and timing errors. If the device ultimately operates as intended, it will function as a general-purpose quantum computer, a goal towards which much current research is focused.