极性分子摆动态的三体量子关联

极性分子具有较长的相干时间和较强的偶极-偶极相互作用,因此它被视为量子信息处理的有效量子载体.基于分子摆动态作为量子比特,研究了处于热平衡状态下三极性分子线性链系统的三体量子关联特性,分析了三体负性熵纠缠度、测量诱导扰动和三体量子失协随与电场强度、分子电偶极矩、分子转动常数、偶极-偶极相互作用和温度等参数有关的三个无量纲变量之间的变化关系.研究表明:在其他参数给定的情况下,随电场强度的增加,三体量子关联均变小;随偶极-偶极相互作用强度的增大,三体量子关联先增加到峰值再逐渐变小;温度越高,负性熵纠缠度和三体量子失协越小,但测量诱导扰动随温度的改变在电场强度和偶极-偶极相互作用影响下呈现不同的变化趋势.此外,通过调节电场强度、偶极-偶极相互作用和温度,可改变与操控极性分子摆动态的三体量子关联.     

Probabilistic remote state preparation by W states

In this paper we consider a scheme for probabilistic remote state preparation of a general qubit by using W states. The scheme consists of the sender, Alice, and two remote receivers Bob and Carol. Alice performs a projective measurement on her qubit in the basis spanned by the state she wants to prepare and its orthocomplement. This allows either Bob or Carol to reconstruct the state with finite success probability. It is shown that for some special ensembles of qubits, the remote state preparation scheme requires only two classical bits, unlike the case in the scheme of quantum teleportation where three classical bits are needed.     

Kerr介质中级联三能级原子与压缩相干态相互作用的光子统计演化

本文研究了存在Kerr介质的高Q腔中压缩相干态与级联三能级原子相互作用的光子统计演化规律,讨论了光场参数、Kerr介质及相干振幅对平均光子数的影响.     

独立元格试探作用量对3维SU(2)格点规范理论相结构的变分研究

应用独立元格试探作用量对3维SU(2)格点规范理论的相结构作了变分计算,所得内能曲线是光滑的,显示理论的禁闭性质.此计算改进了应用独立链试探作用量作变分累积展开方法所得的结果.     

格点规范理论的层子质量重整化(Ⅰ)强耦合和过渡区

用固定ρ介子质量对层子质量m(g)重整化. 强耦合展开得到g≥2时的m(g). 变分法计算把m(g)延拓到g~1处, 即已进入过渡区. 在强耦合区两种计算方法结果相符. 进入过渡区后, m(g)迅速下降, 有明显的向弱耦合区过渡的趋势.     

二维网状Pd(Ⅱ)配合物的合成、晶体结构及电化学性质(英文)

A novel palladium(Ⅱ) complex [Pd(H2bpdc)Ala]Cl·3H2O (where H2bpdc is 2,2′-bipyridine-3,3′-dicar- boxylic acid and Ala is L-alanine) has been synthesized and characterized by IR spectra and elemental analysis. The crystal structure of the complex has been determined by single-crystal X-ray diffraction analysis. It crystallizes in triclinic system, space group P1 with a=0.685 5(2) nm, b=0.988 4(4) nm, c=1.349 6(4) nm, α=98.375(8)°, β= 97.900(15)°, γ=90.118(15)°, V=0.895 9(5) nm3, Z=2. In the molecule, Pd(Ⅱ) atom is four-coordinated and located at the centre of a planar quadrangle. The complex is assembled via intramolecular π-π stacking interactions and hydrogen bonds, which forms 2D network. The cyclic voltammetric behavior of the complex was also investigated.     

Teleportation of a two-particle four-component squeezed vacuum state by linear optical elements

We present a linear optical scheme for achieving a unity fidelity teleportation of a two-particle four- component squeezed vacuum state using two entangled squeezed vacuum states as quantum channel. The devices used are beam splitters and ideal photon detectors capable of distinguishing between odd and even photon numbers. Moreover, we also obtain the success probability of the teleportation scheme.     

格点Schwinger模型"介子"波函数的变分研究

本文用变分法研究格点Schwinger模型"介子"波函数、计算了矢量和标量介子的质量比、以及矢量介子质量的绝对值,得到与连续理论严格解相近的结果.     

急性瘦肉精中毒检材的QuEChERS净化-液质联用快速确证方法

目前液相色谱串联质谱法测定动物源性食品中瘦肉精普遍采用酶水解提取、固相萃取净化的方式处理样品,该方法耗时长、分析成本高。 本研究采用酸水解和酶水解两种提取方式结合QuEChERS(Quick,Easy,Cheap,Effective,Rugged,Safe)净化和高效液相色谱串联质谱建立了动物性食品中特布他林、沙丁胺醇、莱克多巴胺和克伦特罗4种β2受体激动剂的快速定性确证和定量检测方法。 采用酶水解提取-QuEChERS净化处理样品,在电喷雾离子源正离子扫描(ESI+)和多反应监测(MRM)模式下,4种瘦肉精在1.0~20.0 μg/L浓度之间呈线性,线性相关系数均大于0.999,检出限和定量限分别为0.1和0.3 μg/kg,猪肉和牛肉样品中4种化合物的回收率为78.5%~112%,相对标准偏差RSD为2.8%~8.9%。 采用酸水解法代替酶水解提取时,尽管对于样品中莱克多巴胺测定结果稍偏低,但样品前处理时间大大缩短。 两种提取方法结合使用对于提高瘦肉精引起的食物中毒应急处置效率具有重要意义。     

Effects of Dzyaloshinski--Moriya interaction and intrinsic decoherence on teleportation via a two-qubit Heisenberg XYZ model

Quantum teleportation via the entangled channel composed of a two-qubit Heisenberg XY Z model with Dzyaloshinski-Moriya (DM) interaction in the presence of intrinsic decoherence has been investigated. We find that the initial state of the channel plays an important role in the teleported state and the average fidelity of teleportation. When the initial channel is in the state |ψ 1 (0) = a|00 + b|11 , the average fidelity is equal to 1/3 constantly, which is independent of the DM interaction and the intrinsic decoherence effect. But when the channel is initially in the state |ψ 2 (0) = c|01 + d|10 , the average fidelity is always larger than 2/3. Moreover, under a certain condition, the average fidelity can be enhanced by adjusting the DM interaction, and the intrinsic decoherence leads to a suppression of the fluctuation of the average fidelity.