含时谐振子系统的时间演化及压缩态

研究了有压缩和驱动项的含时谐振子系统的时间演化.通过适当选取厄密不变量，得到含时谐振子系统的量子态时间演化的封闭解及该系统的时间演化算符，给出产生压缩态的条件，得出驱动项不影响系统压缩态的结论. 关键词：     

相位损耗腔中大失谐Jaynes-Cummings模型中熵的演化

研究了一位于相位损耗腔中大失谐下二能级原子与相干态场相互作用系统中，光场线性熵、原子线性熵以及光场－原子系统线性熵的演化，讨论了原子初始状态和光场的平均光子数对各线性熵的影响，结果表明，光场线性熵和原子线性熵的演化都较强地依赖于原子初始状态，而系统线性熵的演化与原子初始状态无关。由于光场平均光子数的增加，光场、原子和系统的线性熵都会增加。     

光纤损耗对光脉冲压缩态的影响

光脉冲压缩态有可能作为量子通信的载体而引起人们注意,在长距离传输中,光纤损耗对光脉冲压缩态影响不能忽略。文章利用量子光学的热库理论,讨论光纤损耗对光脉冲压缩态带来的影响。初步计算表明其影响是很大的,要长距离传输必须利用位相有关的放大系统对光脉冲压缩态进行中继放大。     

二次型含时间的谐振子系统的压缩态和压缩相干态

利用演化算符方法研究了最一般的二次型含时间的谐振子系统的时间演化和压缩态问题,进一步讨论了脉动质量的受迫谐振子系统的压缩态和高n压缩态.最后,构造了在时间演化过程中保持最小测不准关系的压缩相干态和高n压缩相干态. 关键词：     

参数共振腔中光子辐射及压缩效应研究

利用热场动力学方法（ＴＥＤ）研究了有限温度下参数共振腔中光子辐射及压缩效应，发现在腔场边界作参数共振运动的条件下，热场光子的存在会显著地增强纯真空光子辐射疚但不影响所产生光场的压缩效应。     

利用强度依赖耦合的Jaynes—Cummings模型的时间演化制备类Schrodinger猫态

提出了制备压缩相干态的叠回态，亦即类Ｓｃｈｒｏｄｉｎｇｅｒ猫态的方案，该方案是基于强度依赖耦合的Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇｓ模型在远离共振极限下的时间演化而设计的。     

通过大失谐的双光子Jaynes—Cummings模的时间演化和对腔？…

提出了通过大失谐的双光子Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇｓ模的时间演化和对腔场的探测生成原子纠缠态的方法。     

原子薛定谔猫态中角动量的压缩及其时间演化

在低Q值腔内，原子相干态在一些特定时刻可以演化为原子薛定谔猫态.讨论了在这种原子薛定谔猫态中原子角动量的涨落和高阶涨落.根据不确定性原理，进一步研究了原子角动量的压缩和高阶压缩性质及其演化.研究表明，原子薛定谔猫态可以被压缩到二阶和六阶，但不能被压缩到四阶.当原子薛定谔猫态中被叠加的原子相干态数为无限多项时，其压缩特性与原子相干态相同. 关键词： 原子相干态 薛定谔猫态 角动量压缩 Bloch态     

通过大失谐的双光子Jaynes-Cummings模的时间演化和对腔场的探测生成原子纠缠态

提出了通过大失谐的双光子ＪａｙｎｅｓＣｕｍｍｉｎｇｓ模的时间演化和对腔场的探测生成原子纠缠态的方法     

结合双模压缩真空态对EPR“佯谬”与量子力学几率波的统一性解释

文章分析了爱因斯坦等人对量子力学不完备的论证过程，通过对双模压缩真空态的偏振正交两光束EPR关联实质讨论，结合EPR光束对实验产生，给出了量子力学几率波解释与EPR“佯谬”的统一必解释，从而在肯定EPR关联实在性的基础上，肯定了量子力学几率波解释的完备性。     

Time Evolution and Squeezing of Degenerate and Non-degenerate Coupled Parametric Down-Conversion with Driving Term

By properly selecting the time-dependent unitary transformation for the linear combination of the number operators, we construct a time-dependent invariant and derive the corresponding auxiliary equations for the degenerate and non-degenerate coupled parametric down-conversion system with driving term. By means of this invariant and the Lewis-Riesenfeld quantum invariant theory, we obtain closed formulae of the quantum state and the evolution operator of the system. We show that the time evolution of the quantum system directly leads to production of various generalized one- and two-mode combination squeezed states, and the squeezed effect is independent of the driving term of the Hamiltonian. In somespecial cases, the current solution can reduce to the results of the previous works.     

Coordinate-Dependent One- and Two-Mode Squeezing Transformation and the Corresponding Squeezed States

We introduce the coordinate-dependent one- and two-mode squeezing transformations and discuss the properties of the corresponding one-and two-mode squeezed states. We show that the coordinate-dependent one-and two-mode squeezing transformations can be constructed by the combination of two transformations, a coordinate-dependent displacement followed by the standard squeezed transformation. Such a decomposition turns a nonlinear problem into a linear one because all the calculations involving the nonlinear one- and two-mode squeezed transformation have been shown to be able to reduce to those only concerning the standard one- and two-mode squeezed states.     

Squeezing Properties of the Generalized Multimode Squeezed States

By means of the invariance of Weyl ordering under similar transformations we derive the explicit form of the generalized multimode squeezed states.Moreover,the completeness relation and the squeezing properties of the generalized multimode squeezed states are discussed.     

量子阻尼振子产生的压缩

用有序算符内的积分技术,求解一维量子阻尼振子的时间演化态.结果表明系统的时间演化态是压缩态.     

The Squeezing Operator and the Squeezed States of "Superspace

ＴｈｅＳｑｕｅｅｚｉｎｇＯｐｅｒａｔｏｒａｎｄｔｈｅＳｑｕｅｅｚｅｄＳｔａｔｅｓｏｆ＂Ｓｕｐｅｒｓｐａｃｅ＂￥ＳＵＮＣｈａｎｇｙｏｕ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＨｅｉｈｅＴｅｃｈｅｒ＇ｓＣｏｌｌｅｇｅ，Ｈｅｉｈｅ１６４３００）ＭＡＡｉｑ...     

Nonlinear Squeezed States and Multiplication Rule of Nonlinear Squeezing Operators Gained via Nonlinear Coherent State Representation and IWOP Technique

Using the nonlinear coherent state representation we derive nonlinear squeezed states and the multiplication rule of nonlinear squeezing operators. We find that the symplectic matrices multiplication rule in nonlinear coherent state projection operator representation maps into the multiplication rule of successive nonlinear squeezing operators.The technique of integral within an ordered product of operators plays an essential role in deriving the multiplication rule.     

Nonlinear Squeezed States and Multiplication Rule of Nonlinear Squeezing Operators Gained via Nonlinear Coherent State Representation and IWOP Technique

Using the nonlinear coherent state representation we derive nonlinear squeezed states and the multiplication rule of nonlinear squeezing operators. We find that the symplectic matrices multiplication rule in nonlinear coherent state projection operator representation maps into the multiplication rule of successive nonlinear squeezing operators.The technique of integral within an ordered product of operators plays an essential role in deriving the multiplication rule.     

Squeezing in a three-level Jaynes-Cummings model with strong field

Squeezing in three-level Jaynes-Cummings model with the strong initial coherent state is studied numerically. The dependence of the squeezing on the field intensity and time is analysed. The cases that the light field is initially in a Fock state and in a squeezed vacuum state are also discussed.     

V型三能级原子双模光场系统中光场压缩性质

本文利用格子液体方法对文献中给出的V型三能级原子玻色-爱因斯坦凝聚体与双模压缩相干态光场相互作用系统的哈密顿量进行分析,发现文献中对原子间相互作用部分的处理有不合理之处,从而对该哈密顿量作出了改进并研究了V型三能级原子双模光场系统中光场压缩性质.结果表明:光场两正交分量交替呈现周期性压缩现象,其压缩深度与光场初始压缩因子密切相关,而压缩时间与双模光场的频率有关. 关键词： 玻色-爱因斯坦凝聚 V型三能级原子 压缩相干态 双模压缩态光场     

Coordinate-Dependent Two-Mode Squeezing Transformations and the Corresponding Squeezed States

We introduce the coordinate-dependent two-mode squeezing transformations and discuss the properties of the corresponding two-mode squeezed states.