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Lorentz Invariance at Finite Temperature and Its Effect on Production Rate and Equation of State

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Chinese Physics Letters 2004年第7期21卷 1228-1231页

作者： HELian-Yi ZHUANGPeng-Fei physicsdepartment TsinghuaUniversityBeijing100084

The effect of Lorentz invariance breaking on the production rate and the equation of state at finite temperature is investigated in the frame of 3 theory. The invariance breaking significantly changes the off-shell de... 详细信息

关键词： Physical properties

Structure of a Phase-Separating System in the Presence of Oscillatory Particles

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Communications in Theoretical Physics 2004年第5X期42卷 773-778页

作者： HUANGFu-Bin ZHUYue-Jin LOUSen-Yue physicsdepartment ShanghaiJiaoTongUniversityShanghai200030China physicsdepartment NingboUniversityNingbo315211China

We numerically simulate the processing of the phase separation of the polymer blend-particle system under fluctuating fields by new discretization's form. Due to the presence of oscillatory particles which have an affinity for one of the components, the ordering mechanism of phase separation will be changed. By changing the oscillatory frequency ω and amplitude γ, we can find the formation of the striped structures either parallel or perpendicular to the oscillatory direction and obtain a diagram describing the orientational ordering of the domain structures.

关键词：共混聚合物相位独立性薄膜材料动力学结构

Knotted Picture of Degree of Entanglement of Quantum Pure State of Two Nodes （χ）=α（↑↓）＋β（↓↑）

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Communications in Theoretical Physics 2004年第4期41卷 531-536页

作者： GUZhi-Yu QIANShang-Wu WANGJing-Shan physicsdepartment CapitalNormalUniversityBeijing100037China physicsdepartment PekingUniversityBeijing100871China physicsdepartment NewJerseyInstituteofTechnologyNewarkNJ07201USA

From the knotted pictures this article gives a possible quantitative measure of the degree of *** suggest to use the area ratio to measure the degree of entanglement, moreover, from the two parts of the non-overlapping area we can also know vividly and pictorially the phase difference between the two variable coefficients α and β.

关键词：双体量子单纯态纠缠态纠缠度部分熵节点图像

Separability of Pure States of the Quantum Network of Three Nodes

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Communications in Theoretical Physics 2003年第1X期40卷 33-38页

作者： GUZhi-Yu QIANShang-Wu physicsdepartment CapitalNormalUniversityBeijing100037China physicsdepartment PekingUniversityBeijing100871China

This article discusses the complete separability and partial separability of the pure states of the quantum network of three nodes by means of the criterion of entanglement in terms of the covariance correlation tenso... 详细信息

关键词：量子网络纯态量子纠缠协方差相关张量

Criterion of Quantum Entanglement and the Covariance Correlation Tensor in the Theory of Quantum Network

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Communications in Theoretical Physics 2003年第1期39卷 15-20页

作者： QIANShang－Wu GUZhi－Yu physicsdepartment PekingUniversityBeijing100871China physicsdepartment CapitalNormaluniversityBeijing100037China

This article discusses the covariance correlation tensor (CCT) in quantum network theory for four Bell bases in detail. Furthermore, it gives the expression of the density operator in terms of CCT for a quantum network of three nodes, thus gives the criterion of entanglement for this case, i.e. the conditions of complete separability and partial separability for a given quantum state of three bodies. Finally it discusses the general case for the quantum network of nodes.

关键词： covariance correlation tensor in quantum network theory criterion of entanglement Bell bases GHZ states

Separability of Pure and Mixed States of the Quantum Network of Four Nodes

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Communications in Theoretical Physics 2003年第4X期40卷 395-400页

作者： QIANShang-Wu GUZhi-Yu physicsdepartment PekingUniversityBeijing100871China physicsdepartment CapitalNormalUniversityBeijing100037China

This article discusses the separability of the pure and mixed states of the quantum network of four nodes by means of the criterion of entanglement in terms of the covariance correlation tensor in quantum network theory.

关键词：混合态纯净态缠结准则离子网络理论协方差相关性张量非零相关性张量

Complete and Partial Separability Conditions of Mixed State for a Quantum Network of Any Nodes

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Communications in Theoretical Physics 2004年第3X期42卷 351-360页

作者： QIANShang-Wu GUZhi-Yu physicsdepartment PekingUniversityBeijing100871China physicsdepartment CapitalNormalUniversityBeijing100037China

By using the block division method in matrix calculus, this article successfully calculate the expectationvalues of the generating operators and the correlation tensors for quantum network of any nodes. Thence, by meansof the criterion of entanglement in terms of the covariance correlation tensor in quantum network theory, this articlediscusses the complete and partial separability conditions of the mixed quantum state for a quantum network of anynodes and judge the separability of a quantum state in the generalcase of any nodes for two examples.

关键词：量子网络理论纠缠准则混合态协变性相关张量量子传输

Separability of Mixed States of the Quantum Network of Three Nodes

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Communications in Theoretical Physics 2003年第2X期40卷 151-156页

作者： GUZhi-Yu QIANShang-Wu physicsdepartment CapitalNormalUniversityBeijing100037China :physicsdepartment PekingUniversityBeijing100871China

This article discusses the complete separability and partial separability of the mixed states of quantum network of three nodes by means of the crJterlon of entanglement in terms of the covarJance correlation tensor i... 详细信息

关键词：量子网络网络节点可分离性混合态纠缠态量子系统

Variable Frequency Harmonic Oscillator in an Electromagnetic Field

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Communications in Theoretical Physics 2004年第1期41卷 45-47页

作者： HUANGBo-Wen WANGJing-Shan GUZhi-Yu QIANShang-Wu physicsdepartment CapitalNormalUniversityBeijing100037China physicsdepartment NewJerseyInstituteofTechnologyNewarkNJ07201USA physicsdepartment PekingUniversityBeijing100871China

The invariant, propagator, and wavefunction for a variable frequency harmonic oscillator in an electromagnetic field are obtained by making a specific coordinate transformation and by using the method of phase space path integral method. The probability amplitudes for a dissipative harmonic oscillator in the time varying electric field are obtained.

关键词： invariant propagator canonical transformation phase space path integral variable frequency harmonic oscillator