Theory of Electrons in Solids

固体电子理论

• 批准号: 0099572
• 负责人: Lu Sham
• 金额: $ 43.5万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-15 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0099572&HistoricalAwards=false
• 关键词: Theory; Electrons; Solids

0099572ShamThe aim of this theoretical research is to contribute to the construction of fundamental devices in quantum information processing and computation, and in spin-enhanced optoelectronics. The research is planned on the theory of the basic physical processes involved in the realization of the quantum algorithms by means of laser manipulation of electrons and their spin degress of freedom in semiconductor nanostructures. A photon in the laser beam can excite an electron in a semiconductor nano-dot into a state known as an exciton. The circular polarization of the light can also give the exciton a specific spin. Here, the spin-polarized exciton is selected as the phsyical representation of the fundamental unit of quantum information, the qubit. Optical control of a single exciton addresses the qubit and optical control of two interacting excitons yields the operation of a quantum logic device. The research consists of (1) a computation of the energy structures of the multiexciton states; (2) a theory of the nonlinear optical spectra of the quantum dot under intense laser excitation as a diagnostic tool for the conditions of operations; (3) design of the optical processes for the operations of the basic devices; (4) a study of the environmental degradation of the quantum nature of the exciton (decoherence); and (5) test of the design by numerical simulations of the time series of operations to accomplish simple versions of key quantum algorithms.%%%The aim of this theoretical research is to contribute to the construction of fundamental devices in quantum information processing and computation, and in spin-enhanced optoelectronics. The research is planned on the theory of the basic physical processes involved in the realization of the quantum algorithms by means of laser manipulation of electrons and their spin degress of freedom in semiconductor nanostructures.***

0099572 Sham本理论研究的目的是为量子信息处理和计算以及自旋增强光电子学中的基础器件的构建做出贡献。 该研究计划通过激光操纵半导体纳米结构中的电子及其自旋自由度来实现量子算法所涉及的基本物理过程的理论。 激光束中的光子可以激发半导体纳米点中的电子进入称为激子的状态。 光的圆偏振也可以赋予激子特定的自旋。 在这里，选择自旋极化激子作为量子信息的基本单位量子比特的物理表示。 单个激子的光学控制寻址量子比特，并且两个相互作用的激子的光学控制产生量子逻辑器件的操作。 研究内容包括：（1）多激子态能量结构的计算，（2）强激光激发下量子点非线性光谱的理论，作为诊断操作条件的工具，（3）基本器件操作的光学过程的设计，（4）量子点非线性光谱的理论。（4）研究激子的量子性质（退相干）的环境退化;（5）通过对操作的时间序列进行数值模拟来测试设计，以实现密钥量子算法的简单版本。该理论研究的目的是为量子信息处理和计算以及自旋增强光电子学中的基础器件的构建做出贡献。 该研究计划通过激光操纵电子及其在半导体纳米结构中的自旋自由度来实现量子算法所涉及的基本物理过程的理论。