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Quantum Statistical Properties of the Exciton in a Leaky Quasi-Mode Cavity

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Communications in Theoretical Physics 2002年第7期38卷 81-84页

作者： yu zhao-xian JIAO Zhi-Yong Theoretical Physics Division Nankai Institute of Mathematics Nankai University Tianjin 300071 China Department of Physics Petroleum University (East China) Dongying 257061 Shandong Province China Department of Physics Petroleum University (East China) Dongying 257061 Shandong Province China

We have studied quantum statistical properties of the exciton in a leaky quasi-mode cavity. It is shown that when the exciton is initially in a squeezed coherent state whereas cavity initially in a vacuum state, there is energy exchange between the exciton and cavity. Both the exciton and cavity may exhibit sub-Poissonian distribution and exist quadrature squeezing. Calculation shows that correlation between the exciton and cavity is classical, which implies that there is not the violation of the Cauchy-Schwartz inequality.

关键词： sub-Poissonian distribution, quadrature squeezing, exciton, a leaky quasi-mode cavity

Fidelity of Interference Between Two Bose-Einstein Condensates with Collision and Dissipation

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Communications in Theoretical Physics 2002年第8期38卷 221-223页

作者： yu zhao-xian JIAO Zhi-Yong Theoretical Physics Division Nankai Institute of Mathematics Nankai University Tianjin 300071 China Department of Physics Petroleum University (East China) Dongying 257061 Shandong Province China Department of PhysicsNankai UniversityTianjin 300071China Department of Physics Petroleum University (East China) Dongying 257061 Shandong Province China

Interference between the two Bose-Einstein condensates with collision and dissipation is investigated. Itis found that when the two condensates are initially in the coherent state, the interference intensity is affected by thecollision and dissipation, but for the initial Fock state, it is only related to the dissipation. Whether the initial stateis in the coherent state or in a Fock state, the fidelity time has nothing to do with collision. For the initial coherentstate, the fidelity loss rate is zero, but for the initial Fock state, it is determined by the initial particle number of thetwo condensates and dissipation.

关键词： fidelity, interference, Bose-Einstein condensate, collision, dissipation

The research of cooperative routing algorithm in mobile Ad hoc networks

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 5-10页

作者： CHEN Chao ZHENG Bao-yu zhao xian-jing Institute of Signal and Information Processing Nanjing University of Posts and Telecommunications Nanjing 210003 China

Cooperative routing technology can efficiently improve the performance of the network by initiatively selecting cooperative nodes to forward the data. In this article, cooperative routing algorithms are proposed and implemented based on three different criteria： optimal channel state, maximal remaining energy, and the shortest path. The simulation based on network simulation （NS） compares the performance of the proposed algorithms with non-cooperative destination-sequenced distancevector （DSDV） protocol. The results reveal that cooperative algorithms outperform DSDV routing protocol with distinctive gains at the cost of sacrificing acceptable normalized network load.

关键词： cooperative routing crosslayer DSDV routing protocol Ad hoc networks

Quantum Correlation of Many Atoms in Spinor Bose-Einstein Condensates

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Communications in Theoretical Physics 2006年第2期45卷 287-292页

作者： yu zhao-xian LIANG Jiu-Qing JIAO Zhi-Yong Institute of Theoretical Physics Shanxi University Taiyuan 030006 China Department of Applied Physics University of Petroleum （East China） Dongying 257061 China

In this letter, we have studied sub-Poissonian distributions and quantum correlation of atoms in spinor Bose-Einstein condensates. It is found that there exists the sub-Poissonlan distributions for spin-1 and spin-（-1） components, respectively. There may exist the violation of the Cauchy-Schwartz inequality. For the same atomic numbers, the regions that include violation of the Cauchy-Schwartz inequality will shift rightwards with the increment of the Rabi frequency, whereas for the same Rabi frequency, the regions will shift leftwards with the increment of the atomic numbers.

关键词： spinor Bose-Einstein condensate sub-Poissonian distribution Cauchy-Schwartz inequality

Ellipsometric Studies of Polyaniline-Effective Dimension of“Conducting”States

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Chinese Physics Letters 1998年第3期15卷 219-220页

作者： yu zhao-xian LIN Yong-yao MO Dang Department of Physics Zhongshan UniversityGuangzhou 510275

A model of fractional-dimensional space is employed to study the measured ellipsometric spectra of polyaniline with acid doping *** from some band parameters,the important dimensional properties of electronic states in the system associated with direct interband transitions can be *** results indicate that as doping density is increased,the effective dimension(D)of electron states in the polyaniline changes from about 1.5D t o near 2.6D,in the same time the polyaniline shows an insulator-metal transition.A brief discussion about the results is given.

关键词： transition doping polyaniline

Quantum Tunneling of a Dipolar Bose-Einstein Condensate in Optical Lattice

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Communications in Theoretical Physics 2008年第1期49卷 123-125页

作者： yu zhao-xian JIAO Zhi-Yong WANG Ji-Suo Department of Physics Beijing Information Science and Technology University Beijing 100101 China Department of Physics China University of Petroleum （East China） Dongying 257061 China Department of Physics Liaocheng University Liaocheng 252059 China

We study quantum tunneling of a dipolar Bose-Einstein condensate in optical lattice when the spin system initially is prepared in a squeezed coherent state. It is found that there exists quantum tunneling between lattices l and l ＋ 1, l and l - 1, respectively. In particular, when the optical lattice is infinitely long and the spin excitations are in the long-wavelength limit, quantum tunneling disappears between lattices l and l ＋ 1, and that l and l - 1. Correspondingly, the magnetic soliton appears.

关键词： dipolar Bose Einstein condensate quantum tunneling

Tunneling of Spinor Bose-Einstein Condensates in Optical Lattice

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Communications in Theoretical Physics 2005年第5X期44卷 837-839页

作者： yu zhao-xian LIANG Jiu-Qing JIAO Zhi-Yong Institute of Theoretical Physics Shanxi University Taiyuan 030006 China Department of Applied Physics University of Petroleum (East China) Dongying 257061 China

In this letter, we have studied the tunneling effects and fluctuations of spinor Bose-Einstein condensates in optical lattice. It is found that there exist tunneling effects and fluctuations between lattices l and l ＋ 1, l and l - 1, respectively. In particular, when the optical lattice is infinitely long and the spin excitations are in the long-wavelength limit, tunneling effects disappear between lattices I and l＋ 1, and I and l - 1. In this case the fluctuations are a constant, and the magnetic soliton appears.

关键词： spinor Bose-Einstein condensate tunneling atomic number fluctuation

Interference of Two-Component Bose-Einstein Condensates with a Coupling Drive in Presence of Dissipation

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Communications in Theoretical Physics 2005年第3X期44卷 532-536页

作者： yu zhao-xian WANG Ji-Suo JIAO Zhi-Yong Beijing Information Technology Institute Beijing 100101 China Department of Physics Liaocheng University Liaocheng 252059 China Department of Applied Physics University of Petroleum (East China) Dongying 257061 China

The interference of the two-component Bose-Einstein condensates with a coupling drive in the presence of the dissipation is studied. We find that when the two-component Bose-Einstein condensates are initially in the coherent states, for the smaller dissipation parameters compared with that of the rf frequency ωrf, the interference intensity exhibits damply oscillation behavior, whereas when the dissipation parameters are larger than that of the ωry, the interference intensity exhibits a fast attenuation behavior. As a comparison, the interference intensity in the absence of the dissipation is also studied. We conclude that the dissipation of the system can be evaluated by selecting the ωrf experimentally.

关键词： interference dissipation two-component Bose-Einstein condensates

Quantum Tunneling of Two-Species Cold Bosonic Atoms in Optical Lattices

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Communications in Theoretical Physics 2008年第7期50卷 95-96页

作者： yu zhao-xian LIU Pu-Ping JIAO Zhi-Yong Department of Physics Beijing Information Science and Technology University Beijing 100192 China Department of Physics Beijing Institute of Graphic Communication Beijing 102600 China Department of Physics China University of Petroleum （East China） Dongying 257061 China

In this letter,we have studied quantum tunneling of two-species cold bosonic atoms in an optical *** the optical lattice is not infinitely long and the spin excitations are not in the long-wavelength limit,quantumtunn... 详细信息

关键词： quantum tunneling cold bosonic atom optical lattice