Scheme for implementing quantum dense coding with W-class state in cavity QED

An experimentally feasible protocol for realizing dense coding by using a class of W-state in cavity quantum electrodynamics （QED） is proposed in this paper. The prominent advantage of our scheme is that the successful probability of the dense coding with a W-class state can reach 1. In addition, the scheme can be implemented by the present cavity QED techniques.

Quantum Teleportation and Superdense Coding via W-Class States

根据 Agrawal 等的协议，我们为远距传物并且稠密的编码的实现建议一个洞证完计划。而不是使用 EPR 状态和 GHZ 状态，我们的计划对由把一个 W 班状态用作一条量隧道的一个粒子的损失更感觉迟钝。而且，我们的计划对热地有免疫力，并且不要求洞在整个过程留在真空状态。

Quantum correlation of a three-particle-class state under quantum decoherence

We investigate the quantum characteristics of a three-particle W-class state and reveal the relationship between quan- tum discord and quantum entanglement under decoherence. We can also identify the state for which discord takes a maximal value for a given decoherence factor, and present a strong bound on quantum entanglement-quantum discord. In contrast, a striking result will be obtained that the quantum discord is not always stronger than the entanglement of formation in the case of decoherence. Furthermore, we also theoretically study the variation trend of the monogamy of quantum correlations for the three-particle W-class state under the phase flip channel, and find that the three-particle W-class state could transform from polygamous into monogamous, owing to the decoherence.

Deterministic quantum teleportation and information splitting via a peculiar W-class state

In the paper （Phys. Rev. 2006 A 4 062320） Agrawal et al. have introduced a kind of W-class state which can be used for the quantum teleportation of single-particle state via a three-particle von Neumann measurement, and they thought that the state could not be used to teleport an unknown state by making two-particle and one-particle measurements. Here we reconsider the features of the W-class state and the quantum teleportation process via the W-class state. We show that, by introducing a unitary operation, the quantum teleportation can be achieved deterministically by making two-particle and one-particle measurements. In addition, our protocol is extended to the process of teleporting two-particle state and splitting information.

Scheme for implementing perfect remote state preparation with W-class state in cavity QED

In this paper we present a remote state preparation scheme with a three-qubit W-class state in cavity QED. It has been shown that a special single-qubit state and a special two-qubit entangled state can be remotely prepared perfectly. Furthermore, the classical information cost in this scheme is less than that in the corresponding teleportation scheme and only a single-qubit projective measurement is made by the sender. We also generalize this idea to the multiqubit W-class state.

基于W和W-class态信道的概率性受控隐形传态

提出利用三粒子W和W-class态传送一个未知单粒子态从而实现受控量子隐形传态的方案。发送者Alice通过这种信道在Bob的控制下传送一个未知单粒子态给接受者Charlie。详细讨论了该方案,并给出了成功概率。

Tetrapartite entanglement measures of W-class in noninertial frames

We present the entanglement measures of a tetrapartite W-class entangled system in a noninertial frame, where the transformation between Minkowski and Rindler coordinates is applied.Two cases are considered.First, when one qubit has uniform acceleration whilst the other three remain stationary.Second, when two qubits have nonuniform accelerations and the others stay inertial.The 1–1 tangle, 1–3 tangle, and whole entanglement measurements π4 and Π4, are studied and illustrated with graphics through their dependence on the acceleration parameter rd for the first case and rc and rd for the second case.It is found that the negativities(1–1 tangle and 1–3 tangle) and π-tangle decrease when the acceleration parameter rd or in the second case rc and rd increase, remaining a nonzero entanglement in the majority of the results.This means that the system will be always entangled except for special cases.It is shown that only the 1–1 tangle for the first case vanishes at infinite accelerations, but for the second case the 1–1 tangle disappears completely when r > 0.472473.An analytical expression for the von Neumann information entropy of the system is found and we note that it increases with the acceleration parameter.

Distillation of GHZ State from Multiple Copies of Arbitrary W-Class State

W。D ü r 等。证明了经由本地操作和古典通讯(LOCC ) 从任意的 W 班状态的一个拷贝获得一个 GHZ 状态是不可能的[W。D ü r， G。Vidal，和 J.I Cirac， Phys。加快。一 62 (2000 ) 062314 ] 。在我们的纸，更一般的案例小心地被调查。我们首先证明与任意的 W 班状态的二个拷贝的供应，我们能总是构造一个明确的过程与非零可能性提取一个 GHZ 状态。然后基于这结果，为从任意的 W 班状态的 n 拷贝提取 GHZ 状态的一个简单过程被介绍。最后，我们简短讨论应用。

Scheme for Implementing Perfect Quantum Teleportation with Non-maximally Entangled W-Class State in Cavity QED

We propose an experimentally feasible teleportation scheme with three-atom W-class state,which was first proposed by Agrawal and Pati [P.Agrawal and A.Pati,Phys.Rev.A 74 (2006) 062320 ],in cavity QED.In this scheme atoms interact simultaneously with a nonresonant cavity and there is no energy exchange between the atoms and the cavity.Thus it is insensitive to the cavity decay,which is of importance in view of experiment.

Characteristics analysis and library development for piezoelectric transformer to drive a ballast for a 35 W class fluorescent lamp using PSPICE modeling

PSPICE model driven by an electric equivalent circuit of a piezoelectric circuit is presented. In order to confirm this model to be effective, an independent model of cold cathode fluorescent lamp(CCFL) driving circuit is used to conduct simulations, leading to a precise modeling. A library is configured through modeling and its accuracy is verified through simulations for widely used and representative lamps such as CCFL, fluorescent lamps, HID lamps, and electrodeless fluorescent lamps. On the basis of experiments, a lamp simulation is also performed using PSPICE, which allows us to take advantage of the lamp library easily. Also, PSPICE model driven by an electric equivalent circuit of a piezoelectric transformer is presented. In order to confirm this model to be effective, an independent model of CCFL driving circuit is used to conduct simulations, leading to a precise modeling. In addition, a new type of electronic ballast is proposed, which allows 35 W-class(T5-class) fluorescent lamp to work. This system is built by a rectifier which has improved power factor and half-bridge series resonant inverter. Also, with size of 27.5 mm high, 27.5 mm wide and 2.5 mm thick, the produced piezoelectric transformer has a high step-up ratio, through which it is possible for the electric ballast circuit to be lighter, smaller and more efficient. After the produced ballast is used to drive the fluorescent lamp for 25 min, it yields 0.95 in power factor correction, 86% in efficiency, 35.07 W in output voltage and 20.5 °C in temperature increase while meeting the characteristics of the 35 W-class fluorescent lamp.

Scheme for Entanglement Concentration of Unknown Multiparticle Greenberger-Horne-Zeilinger or W Class States

We present,two schemes for concentrating unknown nonmaximally entangled Greenberger Horme-Zeilinger(GHZ) or W class states.The first scheme for concentrating the nonmaximally entangled GHZ state is based on linearoptical devices.The second scheme for concentrating the W class states can be applied to a wide variety of atomic state.Both of our schemes are not postselection ones and are within the current technologies.

百瓦级热声斯特林发电系统输出特性研究

热声发电技术在太阳能、工业废热等低品位热能利用方面具有广阔的应用前景。该文从电–力–声类比的角度对直线发电机的控制方程进行了理论分析,并借助线性热声理论对热声斯特林发电系统进行了模拟计算,分析了外接负载、电路谐振和四通处压力振幅对热声发电系统输出特性的影响。理论计算表明通过降低发电机电路的虚部阻抗,调节直线发电机的声阻抗,可以大大改善热声发电系统的输出特性。设计并搭建了热声斯特林发电实验台,实验证明在发电机电路中串入电容器降低虚部阻抗后,系统的输出电功从122.9W增加至150.6W,同时热电效率从5.3%提高到7.8%。

利用超导量子相干装置一步制备W类纠缠态(英文)

鉴于一种新形式的W类纠缠态作为纠缠通道可以实现概率为100%的量子隐形传态和密集编码的特殊优势,提出了一个基于超导量子相干装置在单模谐振腔中制备该W类纠缠态的方案。在这个方案里,只需利用超导量子相干装置和腔场发生共振相互作用,一步便可制备W类纠缠态。在目前的腔QED技术条件下,该方案是可以实现的。

W类态三纠缠原子与相干态光场相互作用过程中光场的量子特性

研究了处于W类态的三纠缠原子与相干态光场相互作用过程中光场的量子特性;运用数值方法,讨论了三纠缠原子初始状态和相干态光场的强弱对系统光场压缩和二阶相干特性的影响。

一个新的单调类定理

定义了集类的ｗ类的概念，给出了ｗ类的单调类定理．

一个新的单调类定理

定义了w-类,由此建立了单调类定理,并给出了w-类的单调类定理的一些等价刻画.

复形的W-Gorenstein分解维数

令W是R-模的自正交类.证明R-复形X的W-Gorenstein分解维数等于所有层次上的R-模Xi的W-Gorenstein分解维数的上确界.

一类三角插值多项式在W_p^rH~α空间的逼近

在WrpHα空间中,利用插值逼近的方法,研究了一类(0,p(D))三角插值多项式逼近的饱和问题,确定了逼近的饱和类与饱和阶.

高职制造类课程融合3D打印技术的教改探究

近年来,3D打印作为一种新兴的可视化技术和工具,已经被广泛地引入到我国的教育教学中。在高职,这一技术的发展也为制造类专业的教育工作提供了新的途径与拓展思路。本文通过将3D打印技术与专业课程有机融合,优化传统教学方式,让学生通过直观实物来验证设计结果的好坏,激发学习热情,提高其思维创新与实践能力。

医学本科开设写作课的探索

医学论文是医学科研交流与传承的基础,良好的科技写作能力已成为优秀医生必备之素质。本科教育是医科院校教育的基础,医学本科生成为未来医务人员的主力军。较强的写作能力是现在的医学生应必须练就的一项基本功,对于其个人成长有极为重要的作用。本文剖析了医学本科开设写作课的必要性,分析目前开设此课程存在的问题,对医学本科写作课的教学目的及师资力量作一设想,并初步规划了医学本科写作课的开课时机、内容设制、授课形式和教学考核模式。