Deterministic remote state preparation of arbitrary three-qubit state through noisy cluster-GHZ channel

We propose a novel scheme for remote state preparation of an arbitrary three-qubit state with unit success probability, utilizing a nine-qubit cluster-GHZ state without introducing auxiliary qubits. Furthermore, we proceed to investigate the effects of different quantum noises (e.g., amplitude-damping, phase-damping, bit-flip and phase-flip noises) on the systems. The fidelity results of three-qubit target state are presented, which are usually used to illustrate how close the output state is to the target state. To compare the different effects between the four common types of quantum noises, the fidelities under one specific identical target state are also calculated and discussed. It is found that the fidelity of the phase-flip noisy channel drops the fastest through the four types of noisy channels, while the fidelity is found to always maintain at 1 in bit-flip noisy channel.     

(2,2''''-联苯酸)(4,4''''-联苯胺)合镍微晶粉体的水热合成及表征

以2,2'-联苯酸(diphenic acid)和联苯胺(Benzidine)为配体,通过水热法制备了2,2'-联苯酸·4,4'-联苯胺合镍[Ni(Dipha)(Benzidine)]微晶粉体(dipha=diphenic acid).通过元素分析、IR、热重分析等手段对配合物进行了表征.     

壳层悬挂β-环糊精单元的两亲性超支化聚合物的分子包合与识别行为

采用紫外分光光度法研究了两种壳层悬挂β-环糊精单元的两亲性超支化聚合物在缓冲溶液(25 ℃, pH=11)中的分子包合与识别行为. 结果表明, 两种聚合物具有来自环糊精单元和两亲性超支化聚合物的双重包合能力, 可分别与水溶性染料分子酚酞(PP)、甲基橙(MO)、有机小分子对硝基苯酚(p-NP)等3种客体分子发生单客体包合效应, 而且其包合能力强于单一的环糊精或两亲性超支化聚合物; 通过客体分子PP和MO证实了这两种聚合物还具有双重识别能力, 可以与PP和MO发生双客体包合效应.     

基于路径映射的埋入混凝土中PZT声能特性分析

利用ANSYS中路径映射方法将压电陶瓷辐射超声波的声压值分布映射到对应的路径上;通过改变路径和角度,并提取数据,分析在79k Hz频率下埋入混凝土中的压电陶瓷进行超声无损检测时声场声能量特性的变化规律。研究结果表明:随着压电陶瓷辐射的声场中扩散角逐渐增加,散射区域增大,声压下降,声能衰减均呈非线性变化,且半扩散角为60°时,声能衰减速度相对较慢;随着压电陶瓷辐射声波传播的距离增大,最大声压和最小声压分布也在发生非线性变化,当半径大于0.09m时,最大声压对应的位置偏离主声轴;当路径对应的半径小于0.08m时,最小声压值对应角度变化较小;当路径对应的半径大于0.08m时,角度变化幅度比较大,大体上是在45°~61°范围内变化;等长度地增加路径对应的半径时,超声波的声能并不是等量减小而是开始时衰减最快,然后逐渐减小。     

吡嗪基联吡啶锌配位聚合物的结构及发光性质

以2,6-双(2-吡嗪基)-4,4'-联吡啶为配体,对苯二甲酸为辅助配体,水热条件下合成了锌配位聚合物[Zn(dpb)(p-bdc)]n·0.5n(dpb),并用元素分析、红外光谱、X射线单晶衍射对此配位聚合物进行了测试分析.单晶结构解析表明,它是通过对苯二甲酸桥连锌离子形成一维链结构的配位聚合物.此外,对配体及配位聚合物的荧光进行了研究.     

Enhanced electron positron pair creation by the frequency chirped laser pulse

Based on the quantum Vlasov equation, the effect of frequency chirp on electron-positron pair production is investigated. The cycle parameter, which characterizes the laser field cycle degree within the pulse, is also considered. In both supercycle and subcycle laser pulses the frequency chirp can greatly enhance the momentum distribution function of created pairs and the pair number density. The pair number density created by a supercycle laser pulse is larger than that by a subcycle pulse under the same laser frequency and chirping. There exists an optimal cycle parameter corresponding to the maximum value of the created pair number density for different chirp rates. It is found that the pair number density is sensitive/insensitive to chirping rate when the cycle parameter lies below/above the optimal one.     

Channel parameters-independent multi-hop nondestructive teleportation

A multi-hop nondestructive teleportation scheme independent of channel parameters based on Bell pairs is presented,where the coefficients of the quantum channel are unknown to all the communication nodes.With Bell measurement and channel matching technology the unknown channel parameters can be eliminated probabilistically with the help of the intermediate nodes.Then the source node Alice can teleport an unknown state to the remote destination node Bob.In our scheme the teleportation is generalized first to the scenario independent of channel parameters,which makes the requirement of quantum channel reduced.Our scheme still preserves the initial unknown state even if this teleportation fails.Moreover,performance analysis shows that our scheme has a higher communication efficiency.     

运用1H-NMR和13C-NMR研究聚对苯二甲酸-2,5-呋喃二甲酸乙二醇共聚酯（PEFT）的序列结构

采用直接酯化法,通过改变对苯二甲酸(PTA)与2,5-呋喃二甲酸(FDCA)的摩尔比,制备了一系列聚对苯二甲酸-2,5-呋喃二甲酸乙二醇共聚酯(PEFT)。运用1H-NMR和13C-NMR测试手段研究PEFT共聚酯的链结构。通过观察PEFT共聚酯链上乙二醇单元中氢原子和碳原子的化学位移及相应的4种信号的强度变化,计算出共聚酯的数均序列长度(L),无规度值(B)和共聚物的组成。通过Yamadera和Murano公式计算所得共聚酯无规度值B均接近于1,说明PEFT共聚酯为无规共聚物;PEF-block-PET嵌段共聚物B为0.577,PEF-blend-PET共混物的B为0;差示扫描量热仪(DSC)测试结果表明,0PEFT共聚酯均有一个玻璃化温度,进一步说明了PEFT共聚酯为无规共聚物。其中PTA∶FDCA的摩尔比为1∶1时,即PEFT-50,B值最大,基于1H-NMR谱图计算得B=1.012,13C-NMR谱图计算得B=1.028。上述结果表明,2,5-呋喃二甲酸与对苯二甲酸在与乙二醇的亲核取代反应中活性相近。     

两例基于相同的含氮及联苯二羧基混合配体构筑的ZnⅡ/CdⅡ配位聚合物:不同的穿插结构和荧光性质

在溶剂热条件下合成了2个锌Ⅱ/镉Ⅱ配位聚合物：{[Zn（1,3-bip）（bpdc）]·0.5H₂bpdc}_n（1）,{[Cd₂（1,3-bip）₂（bpdc）₂]·DMF}_n（2）,H₂bpdc=4,4''-联苯二甲酸,1,3-Bip=1,3-二（咪唑基）丙烷。并通过X射线单晶衍射,粉末XRD、红外光谱、元素分析以及热重分析对其结构进行表征。单晶解析结果表明：配位聚合物1是一个五重穿插3D→3D三维空间网络结构,配位聚合物2是一个二重穿插的2D→2D二维的（4,4）网格层状结构。另外,研究了2个配位聚合物在室温下的热稳定和荧光性能。     

聚对苯二甲酸-2,5-呋喃二甲酸乙二醇无规共聚酯的合成与表征

以对苯二甲酸、2,5-呋喃二甲酸(FDCA)和乙二醇为原料,钛酸四丁酯为催化剂,采用直接酯化法,通过改变对苯二甲酸与2,5-呋喃二甲酸摩尔比合成了一系列高分子量线性聚对苯二甲酸-2,5-呋喃二甲酸乙二醇无规共聚酯(PEFT).运用1H-NMR和13C-NMR表征并确立了共聚酯的结构,XRD结果显示该系列共聚酯在原生态状态下均为无定形聚集态结构,DSC结果表明该系列共聚酯只有一个玻璃化转变温度(73.3～84.2℃),介于PET和PEF之间,随着PEF含量的增加而增大.TGA结果显示该系列聚酯具有良好的热稳定性,起始热分解温度高于390℃,介于PET和PEF之间.拉伸测试结果表明共聚酯的组成对其力学性能有影响,其中PEFT-10,PEFT-70和PEFT-90的力学性能较好,优于PET.