利用单光子的量子对话

提出了一个利用一束单光子对话的方案.在方案中,利用两个不同的幺正操作对光子态进行编码,并且从一束光子中选择较大的子集进行窃听检查,该方案能够有效地抵御截取再发送袭击.此外,由于利用单光子没有利用EPR对,因此该方案是很实际的.该方案是绝对安全的.     

余模分解与余代数分解的关系

设M是C-余模,C和M分别能被分解成不可分的子余代数和子余模的直和.给出这两个分解式之间的关系,从而给出了C的可约性和可分性与M的相关可约性和可分性之间的关系.     

概率远程制备多粒子GHZ纠缠态

利用一个(N 1)粒子部分纠缠Greenberger-Home-Zeilinger(GHZ)态作为量子通道,提出了概率远程制备N粒子GHZ态的两个方案.我们考虑了怎样远程制备一个任意的GHZ态,即两个参数α和β都是复数的情况.此外,计算了远程制备总的成功概率和需要的经典信息量.     

Universal quantum computation using all-optical hybrid encoding

By employing displacement operations, single-photon subtractions, and weak cross-Kerr nonlinearity, we propose an alternative way of implementing several universal quantum logical gates for all-optical hybrid qubits encoded in both single-photon polarization state and coherent state. Since these schemes can be straightforwardly implemented only using local operations without teleportation procedure, therefore, less physical resources and simpler operations are required than the existing schemes. With the help of displacement operations, a large phase shift of the coherent state can be obtained via currently available tiny cross-Kerr nonlinearity. Thus, all of these schemes are nearly deterministic and feasible under current technology conditions, which makes them suitable for large-scale quantum computing.     

Quantum Fluctuation of Mesoscopic Capacitance Coupled Circuit in a Thermal Vacuum State

The quantum fluctuations of mesoscopic capacitance-coupled circuit in thermal vacuum state are investigated by using the theory of thermal field dynamics on the basis of quantization of the mesoscopic circuit. It is shown that under a definite temperature, the fluctuations of electric charges and currents change with temperature. The higher the temperature, the more quantum noise the coupled circuit exhibits.     

散在单群HS和C03上的点Hopf代数

每一个非拟-1型的Nichols代数是无限维的．文中找出了散在单群HS和Co3上的所有的拟一1型的Nichols代数。     

交叉积的同调维数

本文证明了当H是有限维半单和余半单的Hopf代数时,R与交叉积R#σH的整体维数是相同的;同时,它们的弱维数也是相同的.     

混凝土工程裂缝原因与预防

混凝土经常出现的裂缝有温度裂缝、干龟裂、干缩裂缝、沉陷裂缝、坍落裂缝。分析了5种裂缝出现的原因，提出了相应的预防措施。     

联氨氧化酶初步纯化及醌类化合物对其活性影响

厌氧氨氧化菌是一种化能自养菌,它具有独特的生理生化特性及生物脱氮机理.对厌氧氨氧化菌进行实验室扩大培养,对其主要代谢酶联氨氧化酶性质进行研究,对联氨氧化酶进行初步纯化,并探究醌类化合物对联氨氧化酶活性的影响.最终得出联氨氧化酶活性最适温度为35℃,最适pH为7.5.酶纯化结果表明超滤相对分子质量在50～100 kDa....