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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

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

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 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

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

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

Entropy of Field Interacting With Two Atoms in Bell State

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Communications in Theoretical Physics 2009年第1期51卷 53-56页

作者： jiao zhi-yong MA Jun-Mao LI Ning FU Xia College of Physics Science and Technology China University of Petroleum （East China） Dongying 257061 China

In this paper, we investigate entropy properties of the single-mode coherent optical field interacting with the two two-level atoms initially in one of the four Bell states. It is found that the different initial states of the two atoms lead to different evolutions of field entropy and the intensity of the field plays an important role for the evolution properties of field entropy.

关键词： entropy optical field two-level atom Bell state entanglement

Quantum Statistical Properties of Binomial Field Interacting with Two Entangled Atoms

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Communications in Theoretical Physics 2008年第10期50卷 971-973页

作者： jiao zhi-yong MA Jun-Mao SHANG yong-Tao LI Ning FU Xia College of Physical Science and Technology China University of Petroleum （East China） Dongying 257061 China

Quantum statistical properties of the binomial field interacting with the two entangled atoms are investi-gated for the different initial *** is found that the sub-Poissonian distribution and the antibunching effect c... 详细信息

关键词： sub-Poissonian distribution antibunching effect binomial field Bell state