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Quantum Statistical Behaviors of Interaction of an Atomic Bose-Einstein condensate with Laser

Communications in Theoretical Physics 2001年第10期36卷 449-454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 investigated quantum statistical behaviors of photons and atoms in interaction of an atomic Bose Einstein condensate with quantized laser field. When the quantized laser field is initially prepared in a superposition state which exhibits holes in its photon-number distribution, while the atomic field is initially in a Fock state, it is found that there is energy exchange between photons and atoms. For the input and output states, the photons and atoms may exhibit the sub-Poissonian distribution. The input and output laser fields may exhibit quadrature squeezing, but for the atomic field, only the output state exhibits quadrature squeezing. It is shown that there exists the violation of the Cauchy-Schwartz inequality, which means that the correlation between photons and atoms is nonclassical.

关键词： atomic Bose-Einstein condensate, sub-Poissonian distribution, quadrature squeezing, CauchySchwartz inequality

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The development study on gas recycling injection in Yaha Gas condensate Field, Tarim Basin, China

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Science China Earth Sciences 2003年第6期46卷 561-568页

作者：孙龙德宋文杰江同文 TarimOilFieldCompany PetroChinaCompanyLimited Tarim

The Yaha Gas condensate Field is the largest one discovered in China so far. In order to enhance the condensate recovery, gas recycling at 50 MPa has been implemented in Yaha field. Such high-pressure injection is very rare throughout the world. This paper offers the description of the geology and fluid phase behavior of Yaha field. The reservoir productivity and injectivity equa-tions, the optimal development and well patterns are presented. The follow-up investigation of the design implementation leads to the reasonable adjustment of the original development plan. The perforation principle and program of gas recycling for Yaha field are set up. The numerical simula-tion is used to predict the future production performance of gas recycling. Finally, a complete set of high-pressure gas recycling technology suite has been established. The field has come on-stream for one and a half year with condensate throughput of 590000 t in 2001, and fat profit returned. The success of high-pressure gas recycling in the Yaha field is of considerable importance from the theoretical and practical points of view and will considerably benefit the future development of other gas condensate fields in China.

关键词： Tarim Basin, gas condensate, phase behavior, development pattern, gas recycling, numerical simulation.

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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

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