Nuclear magnetic resonance for quantum computing: Techniques and recent achievements

Rapid developments in quantum information processing have been made, and remarkable achievements have been obtained in recent years, both in theory and experiments. Coherent control of nuclear spin dynamics is a powerful tool for the experimental implementation of quantum schemes in liquid and solid nuclear magnetic resonance(NMR) system,especially in liquid-state NMR. Compared with other quantum information processing systems, the NMR platform has the advantages such as the long coherence time, the precise manipulation, and well-developed quantum control techniques,which make it possible to accurately control a quantum system with up to 12-qubits. Extensive applications of liquid-state NMR spectroscopy in quantum information processing such as quantum communication, quantum computing, and quantum simulation have been thoroughly studied over half a century. This article introduces the general principles of NMR quantum information processing, and reviews the new-developed techniques. The review will also include the recent achievements of the experimental realization of quantum algorithms for machine learning, quantum simulations for high energy physics, and topological order in NMR. We also discuss the limitation and prospect of liquid-state NMR spectroscopy and the solid-state NMR systems as quantum computing in the article.     

基于严格耦合波理论的宽光谱金属介质膜光栅衍射特性分析

基于严格耦合波理论建立了金属介质膜光栅的衍射机理模型,给出了TE模式金属介质膜光栅衍射效率的表达式.以-1级衍射效率和工作带宽为评价函数,对金属介质膜光栅的表面浮雕结构进行了优化设计.对于800 nm和1053 nm为中心的TE波,设计的金属介质膜光栅-1级衍射效率优于97%的工作带宽分别达到130 nm和150 nm,最后讨论了设计的宽光谱高衍射效率金属介质膜光栅的制备工艺容差.此研究对于提高脉宽压缩光栅的性能具有重要的意义. 关键词： 衍射效率 金属介质膜光栅 严格耦合波理论     

宽光谱高衍射效率脉宽压缩光栅设计和性能分析

基于飞秒激光对脉宽压缩光栅宽光谱和高衍射效率的要求,提出了一种金属介质膜结构的宽光谱高衍射效率脉宽压缩光栅,该光栅由基底、金属介质膜和表面浮雕结构组成.为获得宽光谱高衍射效率的脉宽压缩光栅,采用严格耦合波理论对金属介质膜光栅的结构参数进行优化设计.数值分析表明当金属介质光栅的槽深、剩余厚度、占空比和入射角分别为272 ...