量子点耦合系统的输运及耗散动力学

项目名称： 量子点耦合系统的输运及耗散动力学

项目编号： No.11304031

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 栗军

作者单位： 德州学院

项目金额： 25万元

中文摘要： 本项目基于我们最近发展的自洽波恩主方程方法，拟针对量子点相关耦合体系的输运及耗散性质开展系统的理论研究。 （1）在新的主方程基础上，重新建立全计数统计理论及大偏离分析方法，使之可以研究任意偏压和协同隧穿情况下的电流涨落性质。 （2）开展各种量子点耦合体系的输运特性研究。着重研究量子点与纳米线（在其中预期可诱导出Majorana费米子）相耦合的杂化体系，期待发现新奇的、可探测的输运性质。 （3）研究量子点耦合系统中电荷及自旋量子比特的耗散动力学行为，分析非马尔科夫（Non-Markov）效应对相干和纠缠的影响，进一步探讨控制退相干、退纠缠的方法。特别研究常规量子比特（电荷或自旋）与拓扑量子比特共存系统中的耗散行为，期待发现由拓扑量子比特的非局域性所导致的特殊效应。我们预期本项目的研究成果不仅能对量子点相关器件的设计和控制有借鉴意义，而且还能提供一个有效的研究电流涨落的理论方法。

中文关键词： 量子点；量子主方程；量子输运；量子信息；

英文摘要： This project will theoretically investigate the behaviors of quantum transport and quantum dissipation in the coupled quantum dot systems using self-consistent Born master equation.(1)Starting from self-consistent Born master equation, we plan to construct full counting statistics theory and large-deviation method, making them to be applicable for arbitrary bias voltages and for dealing with cotunneling process.(2)We will investigate transport characteristics of various quantum dot systems. We focus on the hybrid system consisting of quantum dots and nanowire(a pair of majorana fermions are anticipated to appear under proper conditions). We expect to find some special effects which can be easily detectable, thus providing possible effective experimental schemes for the detection of majorana fermions.(3)We will study the dynamical behaviors of quantum dissipation for both electron charge qubits and spin qubits in coupled quantum dot systems, and analyze the influences of non-markov effects on coherence and entanglement. Based on the research result, we will discuss how to protect quantum coherence and entanglement from decoherence. For the combined system in which conventional qubit (charge or spin) and topological qubit coexist, we expect to find some special effects induced by the nonlocal topological qubit. W

英文关键词： quantum dot；quantum master equation；quantum transport；quantum information；