项目名称： 基于金刚石NV色芯与光学微腔相互作用的量子信息处理

项目编号： No.11475021

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 章梅

作者单位： 北京师范大学

项目金额： 80万元

中文摘要： 以量子通信与量子计算为主要内容的量子信息，能提供安全的通信模式和快速的并行计算能力，在科学研究、数据处理和信息安全等领域有重要的应用价值。基于单一物理体系的量子信息处理方案很难同时克服可扩展性和消相干性这两大物理实现中的瓶颈。然而，金刚石NV色芯和光学微腔耦合体系结合了光子和固态量子系统的优点，避免了彼此的缺点，是一个很好的量子信息处理平台，且NV色芯在室温下就具有比较长的相干时间。基于这一杂化体系，已有的模型主要是针对单一波段甚至单一中心波长的光场对耦合系统的操控，构造的普适量子门大都基于比较理想的单光子输入输出关系和两比特系统，与实验发现有一定的偏差。我们将重点研究可见光和微波等多波段光场对几种光学微腔中的NV色芯耦合系统的有效操控方法，研究各自由度量子态之间的转化和基于这一模型下的既能长时间存储又能方便传输的量子中继器，设计紧跟实验进展的优化普适量子门，为量子信息的发展做出贡献。

中文关键词： 量子信息处理；金刚石NV色芯；光学微腔；量子纠缠；量子门

英文摘要： Quantum information, including quantum communication and quantum computer, provides some secure ways for the transmission of information between legal users and the powerful capability for parallel computation. It is useful in some important fields, such as scientific research, data processing, and information security. The proposals for quantum information processing (QIP) based on some a single physical system cannot overcome the two bottlenecks in their physical implementation, i.e., the scalability and the long coherence time. However, the hybrid quantum system by combining a diamond nitrogen-vacancy center and an optical microcavity is a good platform for QIP as it is in possession of the advantages coming from both photonic systems and solid-state quantum systems, but not their defects. Moreover, NV centers have a long coherence time even at the room temperature. The previous proposals for QIP with this hybrid system are almost based on the fields with a single wave length and those for universal quantum gates are based on the ideal input-output relation of the single photon from the cavity. There are some differences between these proposals and the outcomes from experimental implementations. In this project, we will investigate the effective methods for manipulating the hybrid system with the multichannel fields and the cavities with some special structures, the ways for the state transfer between several degrees of quantum systems, some practical quantum repeater protocols in which quantum states can be stored in a long time and the flying qubits are robust, and the optimal universal quantum gates with shorter operation time. We hope our work can give some contribution to the development of QIP.

英文关键词： quantum information processing;diamond nitrogen-vacancy centers;optical microcavity;quantum entanglement;quantum gates