Correlation dynamics of two-parameter qubit-qutrit states under decoherence

We investigate the dynamics of correlations for two-parameter qubit-qutrit states under various local decoherence channels including depahsing, phase-flip, bit- and trit-flip, bit- and trit-phase-flip, and depolarizing channels. We find that, under certain conditions, the classical correlations may not be affected by the noise or decay monotonically. The quantum correlations measured by measurement-induced disturbance (MID) show three types of dynamical behaviors: (i) monotonic decay to zero, (ii) monotonic decay to a nonzero steady value, (iii) increase from zero and then decrease to zero in a monotonic way. Consequently, we find that, differing from the dynamics of entanglement, the present classical and quantum correlations do not reveal sudden death behavior.     

时隙交织信道的四波混频均衡再生

给出了适用于多波长再生的数据抽运简并四波混频(FWM)耦合模方程组,提出了时隙交织波长信道再生的准相位匹配均衡方法。从优化设计简并FWM相位失配因子入手,针对实验室已有的光纤,实现了4个固定波长信道的均衡再生;通过设计光纤参数,在一定带宽范围内可实现任意4个波长的均衡再生。计算结果表明,再生输出信号的脉冲峰值功率、消光比(ER)和Q值之间的差异分别不超过0.25dB、0.42dB和1.5。     

刺参种子后熟调控技术研究

以刺参种子为供试材料,通过多因子交叉重复实验对影响刺参种子后熟的主要因素进行了筛选,并确定了其影响水平.采用2.50mg·L-1 GA3和2.60~2.80mg·L-12,4-D混合溶液浸泡48h,将种子与河砂(1∶3)混合,变温处理140~147d,白天温度为(22±2)℃,处理14h,夜间温度为(8±2)℃,处理10h.结果表明,心形胚发生率为98.6%,子叶胚发生率为95.7%,播种后发芽率达96.0%.获得了刺参种子的后熟条件,可应用于刺参的育苗.     

乙二醇中钯催化无配体的室温Suzuki反应

报道了一种在室温下醋酸钯催化乙二醇中无外加配体的Suzuki反应体系.以K3PO4·7H2O为碱,在该体系中可高效进行芳基溴代物和芳基硼酸的Suzuki交叉偶联反应,具有反应条件温和、无需惰性气体保护等特点.在n(ArBr)=0.5mmol,n(ArB(OH)2)=0.75mmol,x(Pd(OAc)2)=0.5mol%,n(K3PO4·7H2O)=1.0mmol,v(乙二醇)=2ml的优化条件下,4-溴苯甲醚和苯硼酸反应20min,分离收率即达95%.     

一道高考题的背景分析和简便解法

2011年高考湖南理数的解析几何题作为倒数第二题,有一定的难度,此题融合了椭圆和抛物线两种曲线,看上去较为复杂,但通过对此题的深入研究,我发现了此题的背景并得到了较为简便的解法．     

Dynamics of Measurement-Induced Disturbance for a Qubit-Qutrit System in Noninertial Frames

We investigate the dynamics of measurement-induced disturbance(MID) for a qubit-qutrit system in noninertial frames under various multi-local decoherence channels(i.e.,dephasing,phase-flip,bit-(trit-) flip,bit-(trit-) phase-flip,and depolarizing channels).We find that,for any acceleration,the MID can decay in a monotonic way to zero or to a nonzero steady value(i.e.,residual MID exists).Consequently,no sudden death of the MID occurs,which is different from entanglement.     

Synthesis and Crystal Structure of (1S)-1,1'-Bis{[N-ethyl-N-(1-methylethyl)-amino]-carbonyl}-2-(hydroxydiphenylmethyl)-ferrocene

The title complex, (1S)-1,1'-bis{[N-ethyl-N-(1-methylethyl)-amino]carbonyl}-2- (hydroxyldiphenylmethyl)-ferrocene ([Fe(C24H22NO2)(C11H16NO)]2·H2O, Mr = 1207.13), was synthesized via (-)-Sparteine-mediated enantioselective directed ortho-lithiation of 1,1'-bis{[N- ethyl-N-(1-methylethyl)-amino]carbonyl}-2-(hydroxydiphenylmethyl)-ferrocene. The structure of the title compound was determined by X-ray single-crystal diffraction. The crystal belongs to the orthorhombic system, space group P212121, with a = 10.26...     

水溶性亚胺配体/钯催化的室温 Suzuki 反应

 设计并合成了一种新型水溶性亚胺双齿配体 I, 并得到其单晶结构. 该配体具有半配位效应和绿色化学特征, 与氯化钯组成的催化体系在空气和室温条件下, 可有效催化乙醇水溶液中的溴代芳烃与芳基硼酸的 Suzuki 交叉偶联反应. 在 n(ArBr) = 0.5 mmol, n(ArB(OH)₂) = 0.75 mmol, x(PdCl₂) = 1%, x(I) = 2%, n(K₂CO₃) = 1.0 mmol, c(EtOH) = 50% 水溶液的优化条件下, 经 20 min 反应, 分离收率即可达到 99%.     

Efficient Multiparty-to-Multiparty Quantum Secret Sharing via Continuous Variable Operations

The one-to-multiparty quantum secret sharing scheme [Phys. Rev. A 71 （2005） 044301] proposed recently is extended to a multiparty-to-multiparty case. Furthermore, the continuous variable operations are employed in the extended scheme to replace the specific discrete unitary operations used in the original scheme. The complete randomicity of the continuous variable characterizing the unitary operations can ensure the security of secret sharing. Moreover, the present scheme is compared with the recent similar scheme [Phys. Rev. A 72 （2005） 012304]. It is found that the efficiency of the present scheme is n times of that of the previous one.