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Observations favor the crossing of phantom divide lines

Science china(Physics,Mechanics & Astronomy) 2010年第3期53卷 562-566页

作者： HUANG TieTie1,2,3, WU PuXun2,3 & YU HongWei2,3 1Department of Physics, Xiangnan College, Chenzhou 423000, china 2Department of Physics and Institute of Physics, hunan normal university, changsha 410081, china 3.ey laboratory of low dimensional quantum structures and quantum control of ministry of education, hunan normal university, changsha 410081, china 1. Department of Physics Xiangnan College Chenzhou 423000 China2. Department of Physics and Institute of Physics Hunan Normal University Changsha 410081 China3. Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education Hunan Normal University Changsha 410081 China

Using three different parameterized dark energy models, we reconstruct the properties of dark energy from the latest 397 Sne Ia, CMB and BAO with the present matter density, Ωm0, given prior. We find that, when Ωm0 is not small, for example, Ωm0 = 0.28 or 0.32, an evolving dark energy with a crossing of phantom divide line is favored and this conclusion seems to be model independent. We also find that the evolving properties of dark energy become more and more evident with the increase of Ωm0 given prior.

关键词： cosmology auelerating expansion dark energy

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Phase effect on dynamics of quantum discord modulated by interaction between qubits

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Chinese Physics B 2015年第9期24卷 101-105页

作者：王国友郭有能曾浩生 Key laboratory of low-dimensional quantum structures and quantum control of ministry of education Department of PhysicsHunan Normal University

We study the effects of the interaction strength and the initial phase on the dynamics of quantum discord in a twoqubit system under both spontaneous emission and dephasing noisy channels. It is shown that the time evolution of quantum discord displays quicker oscillations with increasing inter-qubit interaction strength but the effect of the initial phase closely depends on the interaction between the qubits. Only for non-zero inter-qubit interaction cases, the evolution of quantum discord is affected by the initial phase and its oscillating amplitude increases with increasing initial phase. A comparison between evolutions of quantum discord and entanglement is also made.

关键词： quantum discord spontaneous emission dephasing

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Exact coherent control to two weakly coupled Bose-Einstein condensates

Exact coherent control to two weakly coupled Bose-Einstein c...

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第十五届全国原子与分子物理学术会议

作者： Honghua Zhong,Wenhua Hai and Shiguang Rong Key laboratory of low-dimensional quantum structures and quantum control of ministry of education,and Department of physics,hunan normal university,changsha 410081,People’s Republic of china

We investigate the exact ac control of two periodically driven and weakly coupled Bose-Einstein condensates in a double-well *** employing two balance conditions we construct new exact Floquet solutions with the degenerate Floquet energy,and give the balance region on the parameter *** is revealed that for some different parameters in the balance region the Floquet solutions exactly describe the macroscopic quantum self-trapping,nonlinear coherent construction and destruction of quantum tunneling,***,we can accurately perform the coherent control by suitably adjusting the system parameters.

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Behavior of quantum decoherence under bang-bang controls

Behavior of quantum decoherence under bang-bang controls

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2010 Chinese control and Decision Conference

作者： Yanhui Wang~(1,2),Chunlei Jiang~1,Zhaohui Peng~1,Xiaofang Tang~1,Minzhuo Zhao~1 1.Department of Physics,hunan university of science and technology,Xiangtan,hunan,411201,P.R.china 2.Key laboratory of low dimensional quantum structures and quantum control(hunan normal university),ministry of education, changsha,hunan,410008,P.R.china

＜正＞Bang-bang（BB） decoupling schemes for low-level atom systems in the cases of adiabatic decoherence alone, amplitude decoherence alone,and the case of adiabatic and amplitude decoherence together have been fully discussed. And for arbitrary-level atom system in amplitude decoherence,BB decoupling scheme was also *** after a review,we give the BB decoupling scheme for an arbitrary-level atom system in general decoherence.

关键词： BangBang decoupling scheme quantum decoherence decoupling operators atom system

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