超导量子比特设计、制备与宏观量子特性研究

项目名称： 超导量子比特设计、制备与宏观量子特性研究

项目编号： No.10874074

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 电工技术

项目作者： 许伟伟

作者单位： 南京大学

项目金额： 36万元

中文摘要： 近年来，随着以量子态为基础的量子信息科学的发展，实现量子信息的传送、处理以及数据计算正在成为人们共同努力的方向。特别是为实现量子计算，必须对适当的量子力学体系中相干的动力学过程进行人为的控制，这一量子态工程已成为现代信息学中一个重要的研究领域。超导量子比特是固态电路，因此可以集成，结构可以进行设计，是目前最有可能成为实用的量子比特实体。本课题进行了超导量子比特的结构电路与器件设计、制备工艺设计、电路参数与系统量子状态的关联等研究工作，同时还在实验表征方面开展了超导量子比特宏观量子现象的研究工作。主要的研究成果有以下几方面：超导约瑟夫森隧道结构成量子比特的设计；结的势垒中两能级状态分析；超导结的材料、制备工艺、电路结构与宏观量子特性的关联；环境噪声对超导电荷量子比特系统量子态的影响；改善宏观量子特性的可能途径；超导量子比特的宏观量子特性表征。

中文关键词： 量子计算；超导量子比特；约瑟夫森结；宏观量子现象

英文摘要： With the development of quantum information science and technology based on quantum states, it is becoming the common target of many researchers in recent years to achieve the transmission, processing and calculations of quantum information. Especially, for the realization of quantum computing, we must control the coherent dynamics process in an appropriate system of quantum mechanics, this project of quantum states has become an important research area in Modern Information Science. Superconducting qubits are solid state circuits, so they can be integrated and their structure can be designed, the most likely, they could be practically applied in all kinds of qubits. On this research topic, we have take efforts on circuits and devices design, preparation technique design and finding relations between circuit parameters and quantum state all above are on superconducting qubits, and macroscopic quantum phenomena in superconducting qubits also have researched by experimental characterization. Main research includes the following aspects: qubits design based on Josephson Tunnel Junctions; analysis of energy level of the qubits; relations between macroscopic quantum characteristics and material, preparation technique, circuit structure of superconducting qubits; the impact on superconducting qubits caused by ambient noise; possible ways in which macroscopic quantum characteristics can be improved; macroscopic quantum properties characterization of Superconducting qubits.

英文关键词： Quantum computing; Superconductivity quantum bit; Josephon Junction; decoherence