检索结果-南通市图书馆

Modulation of the octahedral structure and potential superconductivity of La3Ni2O7 through strain engineering

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年

作者： Zihao Huo Zhihui Luo Peng Zhang Aiqin Yang Zhengtao Liu Xiangru Tao Zihan Zhang Shumin Guo Qiwen Jiang Wenxuan Chen Dao-Xin Yao Defang Duan Tian Cui key laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-sen University moe key laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University Institute of High Pressure Physics School of Physical Science and Technology Ningbo University

The recent transport measurements of La3Ni2O7uncovered a“right-triangle”shape of the superconducting dome in the pressure-temperature （P-T） phase *** by this,we perform theoretical first-principles studies of La3Ni2O7with the pressure ranging from 0 to 100 ***,we reveal a pressure dependence of the Ni-d2zelectron density at the Fermi energy (nE Fz) that highly coincides with such *** this basis,we further explore the electronic structure under uniaxial *** tracking the stress response of nE Fz,we propose that superconductivity can be achieved by applying only～2 GPa of compression along the c *** idea is further exemplified from the perspectives of lattice distortion,band structure,Fermi surface and superconducting phase *** also discuss the possible charge modulation under the stress and provide an insight into the relation between nE Fzand the superconducting Tcin *** study provides new routes to the search of high-Tcsuperconductors in future experiments.

关键词：

Entangling two levitated charged nanospheres through Coulomb interaction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第7期33卷 352-359页

作者：李国耀尹璋琦 Center for quantum Technology Research and key laboratory of Advanced Optoelectronic quantum Architecture and measurements(moe) School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Limited by the thermal environment, the entanglement of a massive object is extremely difficult to generate. Based on a coherent scattering mechanism, we propose a scheme to generate the entanglement of two optically levitated nanospheres through the Coulomb interaction. Two nanospheres are charged and coupled to each other through the Coulomb *** this manner, the entanglement of two nanospheres is induced either under a weak/strong optomechanical coupling regime or under an ultra-strong optomechanical coupling regime. The charges, radius and distance of the two nanospheres are taken into consideration to enhance the Coulomb interaction, thereby achieving a higher degree of entanglement in the absence of ground-state cooling. The corresponding maximum entanglement can be attained as the dynamics of the system approaches the boundary between the steady and the unsteady regimes. This provides a useful resource for both quantum-enhanced sensing and quantum information processing, as well as a new platform for studying many-body physics.

关键词： quantum entanglement coherent scattering Coulomb interaction

Alternating Current Zeeman and Stark Interference Effect in Ramsey Separated Oscillating Fields

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第2期18卷 202-204页

作者： CHEN Jing-Biao WANG Feng-Zhi YANG Dong-Hai WANG Yi-Qiu Department of Electronics and Key Laboratory for Quantum Information and Measurements of Education MinistryPeking UniversityBeijing 100871

Analytic expressions have been derived of the alternating current(ac)Zeeman and ac Stark effect in an atomic beam magnetic resonance method using Ramsey separated oscillating *** interesting feature which will affect the normal Ramsey pattern is that an interference fringe is superimposed on the dispersion lineshapes of the normal ac Zeeman or ac Stark *** point out that this new character of ac Zeeman(ac Stark)effect generally exists in all kinds of Ramsey method,for example,in the optical Ramsey atomic interferometer and atomic beam frequency *** important implication is that,particularly in an atomic beam frequency standard using Ramsey method,this effect has an influence on the evaluation of the second-order Doppler frequency shift.

关键词： effect Ramsey Zeeman

Effect of Raman-pulse duration related to the magnetic field gradient in high-precision atom gravimeters

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第3期27卷 137-145页

作者： Yuan Cheng Yu-Jie Tan Min-Kang Zhou Xiao-Chun Duan Cheng-Gang Shao Zhong-Kun Hu moe key laboratory of Fundamental Physical Quantities measurements Hubei Key Laboratory of Gravitation and Quantum PhysicsSchool of PhysicsHuazhong University of Science and TechnologyWuhan 430074China

The effect of the Raman-pulse duration related to the magnetic field gradient, as a systematic error, is playing an important role on evaluating the performance of high-precision atomic gravimeters. We study this effect with a simplified theoretical model of the time-propagation operator. According to the typical parameters, we find that this effect should be taken into account when the gravimeter reaches an accuracy of 10^-10g, and the larger the pulse duration is, the more obvious the systematic effect will be. Finally, we make a simple discussion on the possibility of testing this effect.

关键词： atom gravimeters magnetic field gradient Raman-pulse duration time-propagation operator

Comparison of the sensitivities for atom interferometers in two different operation methods

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第1期27卷 351-356页

作者：段小春毛德凯邓小兵周敏康邵成刚祝竺胡忠坤 moe key laboratory of Fundamental Physical Quantities measurements Hubei Key Laboratory of Gravitation and Quantum PhysicsSchool of Physics Huazhong University of Science and Technology Shanghai Institute of Satellite Engineering

We investigated the sensitivities of atom interferometers in the usual fringe-scanning method （FSM） versus the fringe- locking method （FLM）. The theoretical analysis shows that for typical noises in atom interferometers, the FSM will degrade the sensitivity while the FLM does not. The sensitivity-improvement factor of the FLM over the FSM depends on the type of noises, which is validated by numerical simulations. The detailed quantitative analysis on this fundamental issue is presented, and our analysis is readily extendable to other kinds of noises as well as other fringe shapes in addition to a cosine one.

关键词： atom interferometer fringe locking fringe scanning sensitivity

Efficiently simulating the work distribution of multiple identical bosons with boson sampling

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2024年第3期19卷 197-206页

作者： Wen-Qiang Liu Zhang-qi Yin Center for quantum Technology Research and key laboratory of Advanced Optoelectronic quantum Architecture and measurements(moe) School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Boson sampling has been theoretically proposed and experimentally demonstrated to show quantum computational ***,it still lacks the deep understanding of the practical applications of boson *** we propose that boson sampling can be used to efficiently simulate the work distribution of multiple identical *** link the work distribution to boson sampling and numerically calculate the transition amplitude matrix between the single-boson eigenstates in a one-dimensional quantum piston system,and then map the matrix to a linear optical network of boson *** work distribution can be efficiently simulated by the output probabilities of boson sampling using the method of the grouped probability *** scheme requires at most a polynomial number of the samples and the optical *** work opens up a new path towards the calculation of complex quantum work distribution using only photons and linear optics.

关键词： quantum simulation quantum work distribution boson sampling linear optic

Application of Electron-Shelving Detection via 423 nm Transition in Calcium-Beam Optical Frequency Standard

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第12期23卷 3198-3201页

作者：黄凯凯张建伟于得水陈振辉庄伟陈景标 key laboratory for quantum information and measurements of Ministry of Education School of Electronics Engineering and Computer Science Peking University Beijing 100871

A new scheme of small compact optical frequency standard based on thermal calcium beam with application of 423 nm shelving detection and sharp-angle velocity selection detection is proposed. Combining these presented techniques, we conclude that a small compact optical frequency standard based on thermal calcium beam will outperform the commercial caesium-beam microwave dock, like the 5071 Cs clock （from Hp to Agilent, now Symmetricom company）, both in accuracy and stability.

关键词： SHARP ANGLE INCIDENCE PROBING LASER-BEAM SPECTROSCOPY ATOMS CLOCK

High-precision three-dimensional atom localization via probe absorption at room temperature

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第12期29卷 258-264页

作者： Mengmeng Luo Wenxiao Liu Dingyu Cai Shaoyan Gao moe key laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic DevicesSchool of PhysicsXi'an Jiaotong UniversityXi'an 710049China

A scheme is used to explore the behavior of three-dimensional(3D)atom localization in a Y-type hot atomic *** can obtain the position information of the atom due to the position-dependent atom–field *** study the influences of the system parameters and the temperature on the atom *** interestingly,the atom can be localized in a subspace when the temperature is equal to 323 ***,a method is proposed to tune multiparameter for localizing the atom in a *** result is helpful to achieve atom nanolithography,photonic crystal and measure the center-of-mass wave function of moving atoms.

关键词： three-dimensional atom localization probe absorption Doppler effect

Micro-Gal level gravity measurements with cold atom interferometry

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第5期24卷 32-43页

作者：周敏康段小春陈乐乐罗覃徐耀耀胡忠坤 moe key laboratory of Fundamental Physical Quantities measurements School of PhysicsHuazhong University of Science and Technology

Developments of the micro-Gal level gravimeter based on atom interferometry are reviewed, and the recent progress and results of our group are also presented. Atom interferometric gravimeters have shown high resolution and accuracy for gravity measurements. This kind of quantum sensor has excited world-wide interest for both practical applications and fundamental research.

关键词： gravity measurements atom interferometer laser cooling and trapping precision measurements