量子点体系中的自旋输运动力学：基于自旋分辨的全计数统计研究

项目名称： 量子点体系中的自旋输运动力学：基于自旋分辨的全计数统计研究

项目编号： No.11204272

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 骆钧炎

作者单位： 浙江科技学院

项目金额： 22万元

中文摘要： 量子点系统是操控自旋量子比特的有效载体，也是实验和理论上重点关注的研究对象。量子点体系中自旋输运特性的研究有助于我们深入了解自旋动力学和输运机制，加深对固态量子信息一些基本问题的理解。本项目拟针对量子点体系中的自旋输运，开展全计数统计研究，主要内容包括以下几个方面。（1）在量子耗散理论的基础上，发展自旋分辨的非马尔可夫量子主方程，并建立自旋分辨的全计数统计理论，为研究真实自旋量子点输运系统的涨落特性提供理论依据。（2）考察非马尔可夫效应与耗散环境（输运电极、外界热库等）参数间的关系，分析不同量子点体系中非马尔可夫效应所导致的独特的自旋输运动力学特性。（3）研究自旋输运全计数统计中的高阶涨落特性和不同自旋分量流的交叉关联，确定自旋高阶涨落关联与自旋量子比特退相干和驰豫等相关物理机制之间的关系，进一步了解这些机制对自旋输运动力学的影响，尤其是非马尔可夫过程所产生的新效应。

中文关键词： 全计数统计；非马尔科夫；退相干；量子涨落；反馈控制

英文摘要： Quantum dot systems are very promising candidate devices for manipulating spin qubits, and have attracted wide attention both theorically and experimentally. The study of spin transport characteristics in quantum dot systems is essential to get deep understanding of spin dynamics, spin transport mechanisms, as well as some fundamental problems involved in the field of solid-state quantum information. We thus propose to study the full counting statistics of spin transport through quantum dot systems, with focus on the following aspects. (1) Derive a spin-resolved non-Markovian quantum master equation based on the quantum dissipation theory. Establish the framework for spin-resolved full counting statistics, which serves as a theoretical basis for studying the fluctuations in spin transport through real quantum dot systems. (2) Investigate the relation between non-Markovian effect and the parameters of the dissipative environments (such as transport electrodes, heat bath, etc.), and analyze the unique features of spin dynamics induced by the non-Markovian effect in various quantum dot systems. (3) Study higher cumulants and mutual spin correlations via spin-resolved full counting statistics. Identify the relation between higher order spin fluctuations and spin qubit dephasing, relaxation, and other related mechani

英文关键词： Full counting statistics；non-Markovian；dephasing；quantum fluctuations；feedback control