The Squeezing Effect in a Mesoscopic RLC Circuit

Using the path integral method we derive quantum wave function and quantum fluctuations of charge andcurrent in the mesoscopic RLC circuit. We find that the quantum fluctuation of charge decreases with time, oppositely,the quantum fluctuation of current increases with time monotonously. Therefore there is a squeezing effect in the circuit.If some more charge devices are used in the mesoscopic-damped circuit, the quantum noise can be reduced. We also findthat uncertainty relation of charge and current periodically varies with the period π/2 in the under-damped case.

The Squeezing Effect in a Mesoscopic RLC Circuit

Using the path integral method we derive quantum wave function and quantum fluctuations of charge andcurrent in the mesoscopic RLC circuit. We find that the quantum fluctuation of charge decreases with time, oppositely,the quantum fluctuation of current increases with time monotonously. Therefore there is a squeezing effect in the circuit.If some more charge devices are used in the mesoscopic-damped circuit, the quantum noise can be reduced. We also findthat uncertainty relation of charge and current periodically varies with the period π/2 in the under-damped case.

Photon higher-order squeezing effects of the q analogue of a single-mode field interacting with a -type three-level atom

The nonlinear theory of interaction between the q analogue of a single-mode field and a Ξ-type threelevel atom has been established. And the formal solution of the Schrodinger equation in the representation and its average number are obtained. Then, the photon squeezing effects are studied through numerical calculation. The results show that the q deformation nonlinear action has a lot of influence on the quantum coherence and quantum properties. When q approaches 1, the theory reduces to the common linear theory.

Kondo effect for electron transport through an artificial quantum dot

We have calculated the transport properties of electron through an artificial quantum dot by using the numerical renormalization group technique in this paper. We obtain the conductance for the system of a quantum dot which is embedded in a one-dimensional chain in zero and finite temperature cases. The external magnetic field gives rise to a negative magnetoconductance in the zero temperature case. It increases as the external magnetic field increases, We obtain the relation between the coupling coefficient and conductance. If the interaction is big enough to prevent conduction electrons from tunnelling through the dot, the dispersion effect is dominant in this case. In the Kondo temperature regime, we obtain the conductivity of a quantum dot system with Kondo correlation.

Homotopy Approach to Fractional Quantum Hall Effect

The topology-based explanation of the origin of the fractional quantum Hall effect is summarized. The cyclotron braid subgroups crucial for this approach are introduced in order to identify the origin of Laughlin correlations in 2D Hall systems. The so-called composite fermions are explained in terms of the homotopy cyclotron braids. Some new concept for fractional Chern insulator states is formulated in terms of the homotopy condition applied to the Berry field flux quantization.

Nonzero Temperature Squeezing of the Time—Dependent Harmonic Oscillator and the Applications to the Capacitive Coupled Electric Circuit

A new way to calculate the nonzero temperature quantum fluctuations of the time-dependent harmonicoscillator is proposed and the properties of squeezing are exactly given. The method is applied to the capacitive coupledelectric circuit. It is explicitly shown that squeezing can appear and the squeezing parameters are related to the physicalquantities of the coupled circuit.

Study on Quantum Fundamental Soliton States

The paper discusses on the quantum fundamental soliton states in the frame of the quantum noalinear Schrodinger equation, calculates position and momentum fluctuations,and analyzes the squeezing effect of photon number in the soliton states.

Non-Zero Temperature Evolution of the Quantum Fluctuations in Time-Dependent Inductive-Capacitive Coupled Circuit

For time dependent inductive capacitive coupled circuits, the quantum fluctuations in the component circuits and the coupling part are computed. Generation of squeezing and the different effects of inductance and capacitance couplings on the quantum fluctuations are rigorously given. Meanwhile, the thermal effects are included.

Nonclassicality of photon-added squeezed vacuum states

By applying the bosonic creation operator to squeezed vacuum states, this paper introduces a new kind of quantum states： photon-added squeezed vacuum states. It also presents an experimental approach to prepare these states, and investigates their quantum statistical properties by the numerical method. The results indicate that these states reveal some interesting non-classical properties, such as anti-bunching effects, squeezing effects and negativities of the relevant Wigner functions.

The q-analogues of two-mode squeezed states constructed by virtue of the IWOP technique

The q-analogues of two-mode squeezed states are introduced by virtue of deformation quantization methods and the technique of integration within an ordered product （IWOP） of operators. Some new completeness relations about these squeezed states composed of the bra and ket which are not mutually Hermitian conjugates are obtained. Furthermore, the antibunching effects of the two-mode squeezed vacuum state S＇s（τ） │00） are investigated. It is found that, in different ranges of the squeezed parameter τ, both modes of the state exhibit the antibunching effects and the two modes of the state are always nonclassical correlation.

大面积静压群桩挤土效应施工控制措施研究

预制管桩在施工过程中,极易引发挤土效应,大面积静压群桩尤为明显。论文依托昆明市某项目大面积群桩施工,通过设置AB两组条件一致试验区,探索更适用于大面积群桩施工过程中挤土效应控制措施。通过对A组试验数据进行分析,改进B组施工控制措施,发现针对大面积静压群桩,适当加大引孔深度、设置深层泄水井对于挤土效应控制更为有效。

二正丁基二硫代氨基甲酸锌配合物的量子化学研究

The geometric configurations of binuclear Zinc( complex Zn2[(n-Bu)2NCSS]4 and the ligand Na[(n-Bu)2 NCSS] have been optimized by B3LYP quantum chemical method. The electronic structures have been performed by density functional theory at B3LYP/6-31G* level. The electronic spectrums of the complex and ligand were calculated by ZINDO/S-CIS method. It is indicated from the calculation that: (1) The coordination effect of bridging ligand is bigger than that of chelating one, and the bridging ligands also translate more charge to Zn than the chelating one. (2) The calculated results about electronic spectrums are similarly to experimental measurement, and farther explain that absorption band at λ=267 nm of complex is assigned to two n → π* transitions :one arising from the bridging ligands and the another mainly arising from the chelating ligands;but absorption band at λ=236 nm of complex is assigned to π → π* transition which the electron mainly translates from the bridging ligands to the chelating ligands. (3) By consideration of delocalization and polar effects in coordination, the charge transfer from ligand to metal decreases the π-π and p-π conjugation effects in the chromophore group NCS2 and to increase the energy needed for the π → π* and n → π* transitions, and results in the absorption bands shifting towards the short wavelength direction.

粉细砂中敞口PHC管桩群桩锤击施工效应

管桩的施工效应对其可打性和承载性能有着重要的影响,然而,管桩群桩施工效应的工程实录却并不多见。为此,结合某电厂粉细砂地基中敞口预应力高强混凝土(PHC)管桩群桩基础工程,通过土体水平位移、孔隙水压力和土塞长度的现场测试,开展了锤击施工挤土效应和土塞效应研究。考虑了群桩施工引起土体水平位移的不定向性,采用由摆式测斜仪工作原理建立的数据处理方法,分析了土体合成水平位移和运动方位角的变化规律。同时,考虑了锤击过程中孔隙水压力动态变化的实时性,采用采样时间间隔为28 s的自动化监测系统,对全过程孔隙水压力的变化进行了测试和分析。结果表明:在松散逐渐过渡到密实的粉细砂地基中,管桩的挤土效应和土塞的闭塞效应随入土深度的增加逐渐减弱;管桩群桩的挤土效应受到前期管桩施工引起土体的挤密作用而减弱,群桩内部的挤土效应比群桩外部的挤土效应更显著;管桩施工只引起桩头贯入位置附近土体孔压的短暂上升,而群桩的施工并不引起孔压的积聚。

平移压缩Fock态下无耗散介观电感耦合电路的量子效应

研究了在平移压缩 Fock态下介观电感耦合电路中电荷和电流的量子涨落 .结果表明 :每个回路中电荷、电流的量子涨落只依赖于两回路的器件参量和压缩参量 ,而与平移参量无关 .

与Λ型原子互作用的二项式光场的量子特性

运用全量子理论,研究了Λ型三能级原子与二项式光场相互作用过程中光场的量子特性;讨论了Λ型三能级原子初始状态和二项式光场系数对光场压缩和二阶相干度特性的影响。在选择较小的原子失谐量γ和二项式光场系数η时,光场表现为光子聚束效应和反聚束效应交替出现,若上述参量较大时,光场呈现完全的反聚束效应;适当选取Δ和η,在一定时域内耦合系统光场的X_1分量将呈现出压缩效应。表明二项式光场与Λ型三能级原子作用时,光场在一定条件下将处于压缩态,且可呈现出持续的反聚束特性。

介观LC电路的量子压缩效应

根据介观电容器可看成一个介观隧道结的物理事实,对介观LC电路作了相应的量子处理.研究表明:介观LC电路将由初始的真空态演化到压缩真空态,并对压缩真空态下的量子涨落进行研究。

压缩真空态的激发态下介观耦合电路的量子效应

通过量子化电容耦合电路和对角化电路哈密顿量 ,研究了介观电路在压缩真空态的激发态下的量子力学效应 .

第Ⅱ类两态叠加多模叠加态光场的非线性高阶压缩特性研究

本文根据量子力学中的线性叠加原理，构造了由多模（即ｑ模）虚相干态｜｛ｉＺｊ｝＞ｑ及其相反态｜｛－ｉＺｊ｝＞ｑ的线性叠加所组成的第Ⅱ类两态叠加多模叠加态光场｜ψ（２）２＞ｑ．利用新近建立的有关双模及多模辐射场的非线性高阶压缩理论，首次对态｜ψ（２）２＞ｑ的两种非线性高阶压缩（即Ｎ次方Ｙ压缩和Ｎ次方Ｈ压缩）效应进行了详细研究．结果表明：１）当Ｎ为奇数时，如果各模的初始相位满足一定的量子化条件，而态间的初始相位差在其态间压缩区内连续变化；或者态间的初始相位差取某一特定值，而各模的初始相位在其腔模压缩区内连续变化时，态｜ψ（２）２＞ｑ就会呈现出周期性变化的、任意阶的Ｎ次方Ｙ压缩效应．２）当ｑ·Ｎ为奇数时，如果各模的初始相位和满足一定的量子化条件，而态间的初始相位差在上述的态间压缩区内连续变化；或者态间的初始相位差取上述的某一固定值，而各模的初始相位和在其腔模和压缩区内连续变化时，态｜ψ（２）２＞ｑ就呈现出周期性变化的、任意阶的Ｎ次方Ｈ压缩效应．３）与文献１０相比，态｜ψ（２）２＞ｑ与态｜ψ（２）１＞ｑ这两者之间的压缩情况正好相反．

非线性介观电路的量子效应

将非线性双向二极管引入介观电路,对非线性介观电路进行量子力学处理。研究表明:由于非线性双向二极管的影响,使得在非线性介观电路可以实现克尔态的制备。并且对克尔态下非线性介观电路的电荷和磁通的量子涨落进行了计算。计算结果表明:两者随时间存在周期性的压缩现象。

与级联三能级原子相互作用的二项式光场的量子特性

运用全量子理论并借助于数值计算方法,研究了与级联三能级原子相互作用的二项式光场的反聚束效应和压缩效应等量子特性,讨论了光场的初始参量对光场量子特性的影响。结果为：当初始光场处于相干态时,光场的反聚束效应间断出现,光场存在较短时间的压缩效应；当初始光场处于中间态时,光场呈现出持续的反聚束效应,其压缩效应的深度和持续时间增加；当初始光场过渡到数态时,光场仍然呈现出持续的反聚束效应,但压缩效应明显减弱直到消失。结果表明：在与原子相互作用过程中,二项式光场展现出显著的非经典性质。