陶寺陶板为板瓦说存疑

陶寺陶板边缘均整齐平直,没有瓦沟疏导雨水,不可能作为板瓦使用;陶板的厚度多在1~2厘米之间,厚度不能满足地板砖承重的需要,不能作为地板砖使用。陶板所在出土单位出土了烟囱、陶水管、灶块等厨房建材,因此陶板可能是厨房用砖。     

利用三个原子同时与单模腔场相互作用制备原子的纠缠态(英文)

提出了制备三原子W态和一个处于最大纠缠的两原子态的方案 ,这些均基于三个原子同时与单模腔场相互作用实现的 与郑郭方案不同 ,本方案的腔场初始处于n光子的热态 ,因而具有更大的现实意义 最后分析了该方案在实验上实现的可行性     

Tavis-Cummings模型中原子的纠缠度

1 Introduction Superposition principleis one of the fundamentals inquantum mechanics . A two-level atom may be in theground state |0〉,the excited state |1〉or the superpo-sition statesC0|0〉 C1|1〉. The coefficientsC0andC1are complex probability amplitudes of |0〉and |1〉respectively. For a system consisting of two atoms ,the state of total system may be in the direct productstates |0 ,1〉or |1 ,0〉. According to the superpositionprinciple ,the total system may also beinthe superpo-sition s…     

Comparison of distribution characteristics of asbestos cement slates in rural and urban regions of Korea

The toxicity of asbestos has been constantly an active research topic. Although asbestos has lots of advantages owing to its stable physicochemical properties and economic characteristics, nations enforce policies prohibiting or limiting its use because of its critical impact on human health. Especially in Korea 96% of imported asbestos are slate construction materials and with the influence of Saemaul movement, thatched roofs have been drastically replaced with slate roofs. Efforts to know the distribution characteristics of extensively used asbestos cement slates and to find out the removal method that suits the distribution characteristics are still in an insufficient state. The purpose of this work was to probe into the distribution of asbestos cement slate buildings in Korea and provide basic data of distribution characteristics for policy making in which consideration of the differences between rural and urban regions is necessary based on findings of the studies so far. It is considered helpful in many ways to solving asbestos cement slate related problems in countries where asbestos usage is increasing even after the 2000s including China.     

腔场纠缠相干态的制备

利用单模腔场与二能级原子相互作用的大失谐Jaynes-Cumm inges模型,制备出三腔场纠缠相干态.     

论李渔戏曲雅俗纠结的风格特征

李渔的《笠翁十种曲》从创作主旨、人物塑造和戏曲语言三方面表现出对世俗情趣的强烈追求,但其俗不同于当时民间上演的低劣粗俗的剧作。李渔以文人之笔写世俗情趣,因此,作品中呈现出文人审美趣味与世俗情趣相互纠结的独特风貌。     

The coming of a classical world

Quantum theory’s unusual predictions stem from its basic formalism which involves concepts like the wavefunction or probabilityamplitudes instead of probabilities. Many serious doubts have been raised about quantum theory’s connection with perceived classical dynamics. How does quantum mechanics, with all its strange ideas, unfold to give us the ‘reality’ of the familiar physical world? What is the connection between theclassical and thequantum! If quantum mechanics is, indeed, the fundamental theory of nature, as is widely accepted, then how does it explainclassicality! In the following, some of the fascinating conceptual problems of quantum mechanics are highlighted. The ‘environment-induceddecoherence’ approach is then discussed as one practical attempt at explaining the emergence of a classical world from an underlying quantum substrate     

国有产权“非人格化”改革思路质疑

传统国有产权的配置形式必须彻底改革,但改革的根本出路并不在于"人格化"还是"非人格化",而是取决于我们是否能将以往的"社会实际占有"转变为"劳动人民实际占有",即通过"劳动人民实际占有"的新途径去实现"社会所有"."非人格化"的联合产权主体行使终极控制权,并不能使国有资本的保值和增值的最大化成为必然."非人格化"改革思路需要解决的三个基本前提,只能是一种良好的夙愿."非人格化"产权实现形式的两大推进条件,更让人对国有产权"非人格化"改革归宿感到忧惧.     

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.     

量子信息学中的量子态

量子力学和信息科学结合产生了量子信息学。在量子信息学中人们利用的是量子态本身，其基本任务是量子态的存储、操纵、传输与读出。在实现信息处理的过程中，量子态叠加原理、量子纠缠和量子退相干等基本原理和基本概念应当充分考虑。