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Stability of Decoherence-Free Subspaces under Stochastic Phase Fluctuations

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Communications in Theoretical Physics 2006年第3X期46卷 447-452页

作者： zeng hao-sheng NIE Jian-Jun KUANG Le-Man Department of Physics Hunan Normal University Changsha 410081 China

We study the stability of decoherence-free subspaces under stochastic phase fluctuations by analytically and numerically evaluating the fidelity of the corresponding decoherence-free subspace bases with stochastic phase fluctuations under the evolution of environment. The environment is modeled by a bath of oscillators with infinite degrees of freedom and the register-bath coupling is chosen to be a general dissipation-decoherence form. It is found that the decoherence-free subspaces take on good stability in the case of small dissipation and small phase fluctuations.

关键词： decoherence-free subspaces stochastic phase fluctuations

Implementation of Non-local Operations for High-Dimensional Systems Through Qubit Quantum Channels

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Communications in Theoretical Physics 2007年第5X期48卷 851-854页

作者： zeng hao-sheng NIE Jian-Jun KUANG Le-Man Department of Physics Hunan Normal University Changsha 410081 China

We propose a method to implement a kind of non-local operation between spatially separated two systems with high dimensions by using only a low-dimensional qubit quantum channel and 2-bit classical communication. For qutrit systems, we further show the creation of non-local maximally entangled state and the construction of the non-local quantum XOR gate in terms of the obtained non-local operations as well as some single qutrit local gates.

关键词： nonlocal operation high-dimensional system

Controlled Telecloning and Teleflipping for One-Qubit Pure States

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Communications in Theoretical Physics 2009年第6期51卷 1023-1026页

作者： ZHAN Xiao-Gui ZHANG Deng-Yu GAO Feng LI Yan-Ling zeng hao-sheng Department of Physics Hengyang Normal University Hengyang 421008 China Department of Physics Hunan Normal University Changsha 410081 China

We propose a scheme for realizing controlled 1→2 telecloning and 1 →1 teleflipping for one-qubit pure states via a quantum network including N agents. The quantum operations used in the information-transmission process are just only one Bell-state measurement, and a series of single-qubit operation. It is shown that the fidelities of the controlled telecloning and teleflipping are independent of the initial states and reach their optimal values of 5/6 and 2/3 respectively on the condition that all the agents collaborate. If any one agent does not cooperate, the fidelities become state-dependent and are always smaller than the corresponding optimal values. The average fidelities are equal to the balanced value 1/2, which implies that on average the state ineepted by any one of the receivers is a fuUy mixed state. Thus no information leaks out to any dishonest receivers. The security of telecloning and teleflipping have been increased greatly.

关键词： controlled telecloning controlled teleflipping agent

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农村土地股份合作制产生原因解析

中国土地科学 2008年第10期22卷 46-51页

作者：唐浩曾福生湖南农业大学经济学院湖南长沙410128

研究目的:分析农村土地股份合作制的产生原因。研究方法:文献研究法、理论研究法和实证研究法。研究结论:以农地非农用收入为主的社区型土地股份合作制的产生原因是集体成员权约束下不断增值的集体收入的第二次分配;以农地农用收入为主... 详细信息

研究目的:分析农村土地股份合作制的产生原因。研究方法:文献研究法、理论研究法和实证研究法。研究结论:以农地非农用收入为主的社区型土地股份合作制的产生原因是集体成员权约束下不断增值的集体收入的第二次分配;以农地农用收入为主的社区型土地股份合作制的产生原因是规避自然和市场风险,节约交易成本;农民自主组建的土地股份合作制的产生原因是分散风险,提供激励和甄别企业家才能。

关键词：土地股份合作制分成制产生原因

利用大失谐Jaynes-Cummings模型制备纠缠相干态

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湖南师范大学自然科学学报 2005年第2期28卷 27-29页

作者：刘琼杨雄曾浩生湖南师范大学物理与信息学院

　提出了一种利用大失谐J C模型制备纠缠相干态的方法,并讨论了实验实现的情况.

关键词：量子光学纠缠腔QED技术

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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囚禁离子内态的相干导致声子场的压缩

湖南师范大学自然科学学报 2007年第3期30卷 55-59页

作者：聂建军曾浩生湖南师范大学物理与信息科学学院中国长沙410081

在非Lamb-Dicke近似下,当驱动经典激光场的频率与质心模红边带发生共振时,两个囚禁离子的内态与声子场耦合的动力学可用非线性Jaynes-Cummings模型来描述.当离子的初始内态处于无相干性混合态、振动声子场初始处于真空态时,演化后声子... 详细信息

在非Lamb-Dicke近似下,当驱动经典激光场的频率与质心模红边带发生共振时,两个囚禁离子的内态与声子场耦合的动力学可用非线性Jaynes-Cummings模型来描述.当离子的初始内态处于无相干性混合态、振动声子场初始处于真空态时,演化后声子场无压缩性;而当离子的初始内态处于有相干性的迭加纯态、振动声子场初始处于真空态时,演化后声子场将表现出压缩性.在适当的初始条件下,声子场将表现出永久性压缩状态,并且压缩随时间作周期性变化.

关键词：声子场相干压缩

Chiral phosphoramidite ligand-modulated palladium auto-tandem catalysis for asymmetric dehydrogenative dienylation of imines with α-alkenes

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Science China Chemistry 2025年

作者： Zhong-sheng Nong hao-Fan Qian Ying-Chun Chen Pu-sheng Wang Liu-Zhu Gong Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Key Laboratory of Drug Targeting and Drug Delivery System (Sichuan University) Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University School of Materials and Chemistry Southwest University of Science and Technology

The development of efficient processes allowing rapid access to complex chiral molecules from easily available alkenes is a long-term pursuit in the synthetic chemistry community. Transition metal-catalyzed asymmetric functionalization of allylic C–H bond represents a unique alternative toward this goal. However, enantioselective dehydrogenative transformation of olefins to value-added optically enriched molecules remains yet to be discovered. Here, we report a highly enantioselective dehydrogenative dienylation of imines with unactivated α-alkenes driven by the synergistic action of palladium complex and carboxylic acid. Chiral phosphoramidite ligands turned out to be superior in modulating the performance of palladium autotandem catalysis and allowed a broad range of α-alkenes and imines to be transformed into chiral dienylamines. Mechanistic studies suggest that the dienes could be in situ generated from α-alkenes through a palladium(0)-mediated dehydrogenative process in the presence of excess benzoquinone oxidants, and then participated in the Pd-chiral phosphoramidite-catalyzed intermolecular vinylogous-type addition to the imines activated by the carboxylic acid co-catalyst. Notably, the second β-H elimination occurring in the dienylation event might be the turnover-limiting step.

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Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

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Tungsten 2025年第1期7卷 71-79页

作者： Ruo-Hang Xu hao-Yu Jiang Dan-Dan Cui Kun-Rong Du Hong-Run Zhang sheng-Jie Xu Ya-Qi Li Zhi-Zhen Ren Liang Wang Wei-Chang hao Yi Du School of Physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen Institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词： Bi4NbO8Br/Bi2WO6 CO2 reduction Heterostructures Photocatalysts