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Nonlinear transport of Bose-Einstein condensates in a double barrier potential

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Chinese Physics B 2008年第11期17卷 3996-4001页

作者：方见树 Institute of Physics Hunan University of Technology Department of Physics Hunan University of Technology

The stable nonlinear transport of the Bose-Einstein condensates through a double barrier potential in a waveguide is studied. By using the direct perturbation method we have obtained a perturbed solution of Cross-Pitaevskii equation. Theoretical analysis reveals that this perturbed solution is a stable periodic solution, which shows that the transport of Bose-Einstein condensed atoms in this system is a stable nonlinear transport. The corresponding numerical results are in good agreement with the theoretical analytical results.

关键词： the nonlinear transport Bose-Einstein condensate perturbed solution

Stability of trapped Bose-Einstein condensates in one-dimensional tilted optical lattice potential

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Chinese Physics B 2011年第4期20卷 80-84页

作者：方见树廖湘萍 Institute of Physics Hunan University of Technology College of Science Hunan University of Technology

Using the direct perturbation technique, this paper obtains a general perturbed solution of the Bose-Einstein condensates trapped in one-dimensional tilted optical lattice potential. We also gave out two necessary and sufficient conditions for boundedness of the perturbed solution. Theoretical analytical results and the corresponding numerical results show that the perturbed solution of the Bose-Einstein condensate system is unbounded in general and indicate that the Bose-Einstein condensates are Lyapunov-unstable. However, when the conditions for boundedness of the perturbed solution are satisfied, then the Bose-Einstein condensates are Lyapunov-stable.

关键词： Bose-Einstein condensate chaos stability tilted optical lattice potential

Sudden death and revival of entanglement of two qubits coupled collectively to a thermal reservoir

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Chinese Physics B 2010年第9期19卷 379-385页

作者：廖湘萍方见树方卯发 College of Science Hunan University of Technology College of Physics and Information Science Hunan Normal University

In this paper, we investigate the entanglement of two qubits coupled collectively to a common thermal environment and find that the the collective decay can lead to a revival of the entanglement that has already been destroyed. We also show that the ability of the system to revival entanglement relies on the mean photon number of the thermal environment and the degree of entanglement of the initial state.

关键词： sudden death of entanglement two qubits the thermal reservoir

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耗散系统中实现原子态量子隐形传态的保真度

物理学报 2011年第9期60卷 73-77页

作者：潘长宁方见树彭小芳廖湘萍方卯发湖南工业大学理学院株洲412008 中南林业科技大学理学院长沙410004 湖南师范大学物理与信息科学学院长沙410081

本文运用全量子理论并结合数值计算方法,研究了压缩真空库中利用原子纠缠态作为量子通道实现原子态量子隐形传态的保真度,讨论了被传送的原子初态形式以及压缩库的压缩参数r对保真度的影响.研究表明:当只有输入态受噪声影响,则被传送的... 详细信息

本文运用全量子理论并结合数值计算方法,研究了压缩真空库中利用原子纠缠态作为量子通道实现原子态量子隐形传态的保真度,讨论了被传送的原子初态形式以及压缩库的压缩参数r对保真度的影响.研究表明:当只有输入态受噪声影响,则被传送的初始态中基态概率越大的态,保真度越高;而当量子通道受影响时,则基态和激发态概率相等的原子叠加态传送的保真度最大.

关键词：量子隐形传态压缩真空库保真度

无反射势阱的非齐次Schrdinger方程的精确解

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原子与分子物理学报 2000年第2期17卷 353-357页

作者：方见树海文华张细利黄卫立株洲师范高等专科学校湖南师范大学物理系长沙410081 湖南师范大学物理系

无反射势阱描述一种双原子分子的吸引势。将Rayleigh Schr dinger展开法应用到微扰无反射势阱 ,得到一组非齐次Schr dinger方程。利用最近报道的微扰方法 ,导出这些方程的积分形式的精确解。以静电场与基态系统的相互作用为例 ,通过精... 详细信息

无反射势阱描述一种双原子分子的吸引势。将Rayleigh Schr dinger展开法应用到微扰无反射势阱 ,得到一组非齐次Schr dinger方程。利用最近报道的微扰方法 ,导出这些方程的积分形式的精确解。以静电场与基态系统的相互作用为例 ,通过精确解的有界及其不能在Hilbert空间展开为有限项的性质 ,论证了该微扰系统束缚态的存在性及通常量子力学发散困难的起因。

关键词：无反射势阱微扰精确解非齐次薛定锷方程

A Complexity View of Acid Deposition

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Chinese Physics Letters 2003年第6期20卷 817-820页

作者：朱建林方见树 DepartmentofChemistry ZhuzhouTeachers'CollegeZhuzhou412007 departmentofPhysics ZhuzhouTeachers’CollegeZhuzhou412007

We show that acid deposition is analogous to complex systems composed of a series of interconnected components. Frequency-size distributions of weekly hydrogen deposition (WHD) of precipitation are consistent with double power-law in two different regimes separated by a crossover WHD. The distribution of variations in acid deposition over a week interval is remarkably symmetrical, with long tail extending over eight orders of magnitude. The acid deposition fluctuations exhibit fractal Brown motion with two different temporal scaling regimes and long-range correlation exists in the series. The power-laws in the acid deposition dynamics are considered to be indicators of self-organization of atmosphere under environmental pollution stress.

关键词： Environmental regulations

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非线性介质中的电磁场

益阳师专学报 1994年第5期11卷 47-52页

作者：方见树物理系

本文给出了非线性介质中Maxwell方程组的一般形式、电极化强度P的表示式，并算出了非线性介质中的电磁场能量密度。

关键词：非线性介质能量密度电磁场

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论“时钟佯谬”的消除

益阳师专学报 1992年第6期9卷 67-73,106页

作者：方见树益阳师专物理系

本文运用广义相对论理论对时钟佯谬问题作出了定性和定量的解释,使时钟佯谬得以消除。

关键词：广义相对论惯性系时钟佯谬

Entanglement dynamics of two-qubit systems in different quantum noises

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Chinese Physics B 2011年第2期20卷 36-40页

作者：潘长宁李飞方见树方卯发 School of Science Hunan University of Technology Department of Physics Hunan University of Science and Technology College of Physics and Information Science Hunan Normal University

The entanglement dynamics of two-qubit systems in different quantum noises are investigated by means of the operator-sum representation method. We find that, except for the amplitude damping and phase damping quantum noise, the sudden death of entanglement is always observed in different two-qubit systems with generalized amplitude damping and depolarizing quantum noise.

关键词： entanglement dynamics quantum noise operator-sum representation