基于LABVIEW的经典关联“鬼”成像虚拟实验

提出了一种利用虚拟仪器开发软件LABVIEW模拟经典热光场的方法,并对经典热光源“鬼成像”实验进行了仿真。程序中通过将相互独立的随机光叠加制造出非相干热光源,然后分为两路并分别记录光场强度信息,最后输入关联器作乘法运算,再对乘积进行多次平均后得到强度关联分布。     

首台单像素三维照相机在沪问世

中科院上海光机所在国际上率先建成了第一台激光三维强度关联成像工程原理样机(国际同行也称之为"单像素三维照相机")。据悉,该项成果来自该所研究员韩申生领衔主持的国家"863"项目"激光三维强度关联成像技术研究"和"被动光学多光谱强度关联成像技术研究"。项目日前在沪通过了科技部组织的专家验收。据韩申生介绍,他们在国际上首次实验演示了实际室外典型遥感场最中的激光三维强度关联成像,并进行了大量晴     

Web信息检索技术中关联规则挖掘算法应用研究

针对Web信息检索系统在海量数据下的服务质量和效率问题,讨论了数据挖掘技术在Internet信息检索中的运用,在经典的关联规则算法研究基础上,通过引入多维链表结构,提出了利用事务集合匹配运算和链表操作高效地挖掘关联规则的算法ARMLL用于提高Web信息检索质量。实验结果表明该算法是可行的,有较高的效率。     

基于矩阵的数据挖掘技术在数字化图书馆中的应用

Apriori算法是关联规则挖掘的一个经典算法，本文在分析关联规则挖掘算法的基础上，提出利用矩阵的数据挖掘技术对经典Apriori算法进行改进，从而提高图书馆数据资源的利用率，提高图书馆服务层次。     

基于关联规则的Apriori挖掘算法改进

关联规则挖掘是-种主要的也是用途最广的数掘挖掘方法.本文首先对关联规则挖掘及其经典Apriori算法作了介绍,然后针对Apriori算法的缺陷,提出了一种改进的关联规则挖掘算法,充分地证明了改进算法的性能优势.     

数据挖掘中关联规则算法的研究

文章首先介绍了数据并挖掘中关联规则的基本理论知识,包括Aprior经典算法、支持度等概念。接着对关联规则的三种并行算法进行了介绍和总结,对其性能作了简要分析。     

数据挖掘中关联规则算法的研究

Apriori算法是关联规则挖掘中的经典算法。通过对Apriori算法的基本思想和性能的研究分析,提出了一种基于垂直事务列表的树形结构的挖掘算法,减少了候选频繁项集的数量,提高了挖掘算法的效率。实验结果表明新算法具有良好的性能。     

一种基于内容关联的学术资源协同推荐算法

利用学习者的关注点集中等特性,提出用网络日志推断学习意图、以内容关联匹配兴趣主题的理论框架和相应的协同推荐算法.实验表明,算法的覆盖率与经典方法无显著性差异,准确率提高5.13％,响应时间缩减为1/9,并在训练测试比小于50％时准确率提高6.73％.     

关联规则在图书馆中的应用

介绍了关联规则的相关概念及理论知识,然后针对关联规则的经典算法Apriori算法提出了改进,即Apriori-high算法,以及改进算法的好处,最后介绍了关联规则在图书馆中的应用,可以提高读者的效率,更好的为读者服务。     

基于Web的数据挖掘技术

Web数据挖掘有很多研究热点,其中关联规则挖掘是Web数据挖掘领域研究的一个重要方面.本文首先对数据挖掘、Web数据挖掘和Web数据预处理等相关知识进行了阐述;然后研究了关联规则基本理论及关联规则经典算法;最后为了解决现实数据库中每个项目的分配不均匀性和重要性差异,重点研究了加权关联规则挖掘算法.     

Manipulation and Preparation of Five-Particle Entanglement

By making good use of certain quantum physics properties such as entanglement,teleportation and superposition, a quantum computer has the potential to be much more powerful than a classical computer of the same size.Although quantum-mechanical entanglement of three or four particles has been achieved experimentally, and has been used to demonstrate the extreme contradiction between quantum mechanics and local realism, the realization of five-particle entanglement, until recently, remains an experimental challenge. As reported in the July 1 issue of Nature, Prof. Pan Jianwei (Jian-Wei Pan) and his colleagues at the University of Science and Technology of China (USTC) in Hefei have succeeded for the first time in the world in entangling five photons and demonstrating a process called "open-destination teleportation". This is another highlight of Prof. Pan' s work since the periodical published an article on experimental entanglement purification of arbitrary unknown states on May 22 in 2003.     

量子纠缠态制备、操纵的实验研究

量子纠缠是量子信息学中最重要也是最为奇特的一个课题.在量子信息学中,量子信息的处理离不开量子态及其操纵,而量子纠缠态毫无疑问是各种各样的量子态中最重要的一种. 利用光子纠缠态开展了以下实验研究:(1)利用连续波激光束泵浦非线性晶体的自发参量下转换过程,制备出了双光子偏振纠缠态,具有较高亮度和纠缠度,并具有纠缠度可调谐的特点. 利用这种纠缠源,制备了量子信息学中一种重要的混合态——Werner态,采用的方案使得Werner态中纠缠的成分是可控制的.(2)利用线性光学元件以及路径比特概念的引入,在实验上用单光子实现了Buek-Hillery普适克隆机,实验结果表明,对任意的输入纯态,此克隆机输出的2份拷贝与初始态均达到5/6的保真度,与理论计算一致.(3)在实验上利用自发参量下转换系统制备的双光子偏振最大纠缠态及非最大纠缠态进行了CHSH不等式的检验,验证了对于2比特纠缠纯态,"纠缠"等价于"Bell不等式违背"这一结论.(4)除了局域隐变量理论之外,还有一种主要的隐变量理论——环境无关的隐变量理论(NCHV),关于这种隐变量,类似于Bell不等式,有一个Kochen-Specker理论,其主要内容是证明NCHV和量子力学的矛盾. 完成了一个用单光子实现的检验Kochen-Spcker理论的实验,实验结果证明了NCHV是不存在的.     

Narratives of quantum theory in the age of quantum technologies

Quantum technologies can be presented to the public with or without introducing a strange trait of quantum theory responsible for their non-classical efficiency. Traditionally the message was centered on the superposition principle, while entanglement and properties such as contextuality have been gaining ground recently. A less theoretical approach is focused on simple protocols that enable technological applications. It results in a pragmatic narrative built with the help of the resource paradigm and principle-based reconstructions. I discuss the advantages and weaknesses of these methods. To illustrate the importance of new metaphors beyond the Schrödinger cat, I briefly describe a non-mathematical narrative about entanglement that conveys an idea of some of its unusual properties. If quantum technologists are to succeed in building trust in their work, they ought to provoke an aesthetic perception in the public commensurable with the mathematical beauty of quantum theory experienced by the physicist. The power of the narrative method lies in its capacity to do so.     

Micius Witnesses “Spooky Action” over 1200km from Outer Space

"Spooky action" triumphs in outer space: A joint team of CAS scientists reported in a cover article in Science the successful survival of quantum entanglement over a distance of1200+ km, and a violation of Bell Inequality.     

量子科学实验卫星——“墨子号”

北京时间2016年8月16日凌晨1时45分,"墨子号"量子科学实验卫星在酒泉卫星发射中心成功发射。该卫星是世界第一颗从事空间尺度量子科学实验的卫星。升空之后,它将配合多个地面站,在国际上率先实现星地高速量子密钥分发、星地双向量子纠缠分发及空间尺度量子非定域性检验、地星量子隐形传态,以及探索广域量子密钥组网等实验。"墨子号"量子科学实验卫星将扩大我国在量子通信领域的国际领先地位,为未来覆盖全球的天地一体化广域量子通信网络建立基础,并将加深人类对量子力学基本原理的理解。     

量子计算的语形表征及其意义

量子计算研究是近年来量子力学最具潜力的发展方向之一。文章从探讨量子计算概念的提出入手,讨论了经典可逆计算的量子表征模式,接着分析了量子计算语形结构的特点,对比了量子计算与经典计算并行性的异同,考虑了测量中的塌缩对量子算法设计的影响,最后以前述的研究为基础讨论了量子计算的哲学意义。     

Drone-based entanglement distribution towards mobile quantum networks

Satellites have shown free-space quantum-communication ability; however, they are orbit-limited from full-time all-location coverage. Meanwhile, practical quantum networks require satellite constellations, which are complicated and expensive, whereas the airborne mobile quantum communication may be a practical alternative to offering full-time all-location multi-weather coverage in a cost-effective way. Here, we demonstrate the first mobile entanglement distribution based on drones, realizing multi-weather operation including daytime and rainy nights, with a Clauser-Horne-Shimony-Holt S-parameter measured to be 2.41 ± 0.14 and 2.49 ± 0.06, respectively. Such a system shows unparalleled mobility, flexibility and reconfigurability compared to the existing satellite and fiber-based quantum communication, and reveals its potential to establish a multinode quantum network, with a scalable design using symmetrical lens diameter and single-mode-fiber coupling. All key technologies have been developed to pack quantum nodes into lightweight mobile platforms for local-area coverage, and arouse further technical improvements to establish wide-area quantum networks with high-altitude mobile communication.     

Topological phases of quantized light

Topological photonics is an emerging research area that focuses on the topological states of classical light. Here we reveal the topological phases that are intrinsic to the quantum nature of light, i.e. solely related to the quantized Fock states and the inhomogeneous coupling strengths between them. The Hamiltonian of two cavities coupled with a two-level atom is an intrinsic one-dimensional Su-Schriefer-Heeger model of Fock states. By adding another cavity, the Fock-state lattice is extended to two dimensions with a honeycomb structure, where the strain due to the inhomogeneous coupling strengths of the annihilation operator induces a Lifshitz topological phase transition between a semimetal and three band insulators within the lattice. In the semimetallic phase, the strain is equivalent to a pseudomagnetic field, which results in the quantization of the Landau levels and the valley Hall effect. We further construct an inhomogeneous Fock-state Haldane model where the topological phases can be characterized by the topological markers. With d cavities being coupled to the atom, the lattice is extended to d − 1 dimensions without an upper limit. In this study we demonstrate a fundamental distinction between the topological phases in quantum and classical optics and provide a novel platform for studying topological physics in dimensions higher than three.     

A new epoch of quantum manipulation

he behavior of individual microscopic particles,such as an atom(or a photon),predicted using quantum mechanics,is dramatically diferent from the behavior of classical particles,such as a planet,determined using classical mechanics.How can the counter-intuitive behavior of the microscopic particle be veriied and manipulated experimentally?David Wineland and Serge Haroche,who were awarded the Nobel Priz in physics in 2012,developed a set of methods to isolate the ions and photons from their environment to create a genuine quantum system.Furthermore,they also developed methods to measure and manipulate these quantum systems,which open a path not only to explore the fundamental principles of quantum mechanics,but also to develop a much faster computer:a quantum computer.