Silicon in the Quantum Limit: Quantum Computing and Decoherence in Silicon Architectures
Charles Tahan
备注：
2005 Thesis. Per a request to post, bit out-dated but includes some relevant calculations (not completely sure if this is the published version or a late draft)
Semiconductor architectures hold promise for quantum information processing (QIP) applications due to their large industrial base and perceived scalability potential. Electron spins in silicon in particular may be an excellent architecture for QIP and also for spin electronics (spintronics) applications. While the charge of an electron is easily manipulated by charged gates, the spin degree of freedom is well isolated from charge fluctuations. Inherently small spin-orbit coupling and the existence of a spin-zero Si isotope facilitate long single spin qubit coherence times. Here we consider the relaxation properties of localized electronic states in silicon due to donors, quantum wells, and quantum dots, including effects due to phonons and Rashba spin-orbit coupling. Our analysis is impeded by the complicated, many-valley band structure of silicon and previously unaddressed physics in silicon quantum wells. We find that electron spins in silicon and especially strained silicon have excellent decoherence properties. Where possible we compare with experiment to test our theories. We go beyond issues of coherence in a quantum computer to problems of control and measurement. Precisely what makes spin relaxation so long in semiconductor architectures makes spin measurement so difficult. To address this, we propose a new scheme for spin readout which has the added benefit of automatic spin initialization, a vital component of quantum computing and quantum error correction. Our results represent important practical milestones on the way to the design and construction of a silicon-based quantum computer.
Giant enhancement of attosecond tunnel ionization competes with disorder-driven decoherence in silicon
Joint Attosecond Science Laboratory, National Research Council（联合阿秒科学实验室，国家研究委员会）；University of Ottawa（渥太华大学）；Quantum and Nanotechnologies Research Center, National Research Council（量子与纳米技术研究中心，国家研究委员会）
Electrically detected magnetic resonance of $^{75}$As magnetic clock transitions in silicon
University of Melbourne（墨尔本大学）；University of Manchester（曼彻斯特大学）；University College London（伦敦大学学院）；RMIT University（皇家墨尔本理工大学）；Australian Research Council Centre for Quantum Computation and Communication Technology（澳大利亚研究委员会量子计算与通信技术中心）；CSIRO（联邦科学与工业研究组织）
Cluster-configurational study of G-center in Silicon
Virginia Tech（弗吉尼亚理工大学）；Virginia Tech Center for Quantum Information Science and Engineering（弗吉尼亚理工学院量子信息与工程中心）；Virginia Tech National Security Institute（弗吉尼亚理工学院国家安全研究所）
