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Generation of complete graph states in a spin-1/2 Heisenberg chain with a globally optimized magnetic field

Physical Review A 2024年第4期109卷 042604-042604页

作者： X. X. Li D. X. Li X. Q. Shao Sino-European Institute of Aviation Engineering Civil Aviation University of China Tianjin 300300 China College of Physics Science and Technology Shenyang Normal University Shenyang 110034 China Center for Quantum Sciences and School of Physics Northeast Normal University Changchun 130024 China Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun 130024 China

Graph states possess significant practical value in measurement-based quantum computation, with complete graph states that exhibit exceptional performance in quantum metrology. In this work, we introduce a method for generating multiparticle complete graph states using a spin-1/2 Heisenberg XX chain subjected to a time-varying magnetic field, which applies to a wide range of systems. Our scheme relies exclusively on nearest-neighbor interactions between atoms, with real-time magnetic field formation facilitated by quantum optimal control theory. We focus specifically on neutral-atom systems, finding that multiparticle complete graph states with N=3–6 can be achieved in less than 0.25µs, using a hopping amplitude of J/(2π)=−2.443MHz. This assumes an initial state provided by an equal-weight superposition of all spin states that are encoded by the dipolar-interacting Rydberg states. Furthermore, we thoroughly address various experimental imperfections and showcase the robustness of our approach against atomic vibrations, fluctuations in pulse amplitude, and spontaneous emission of Rydberg states. Taking into account the common occurrence of disturbances in the experimental setups of neutral-atom systems, our one-step strategy to achieve such graph states emerges as a viable alternative to techniques based on controlled-Z gates.

关键词： Electric dipole-dipole interactions Quantum control Quantum information theory Zeeman effect Rydberg atoms & molecules Two-level models

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key Techniques on Unified Identity Authentication in OpenMBEE Integration 4

Key Techniques on Unified Identity Authentication in OpenMBE...

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4th IEEE International Conference on Electronics and Communication Engineering, ICECE 2021

作者： Xue, Junjie Zhou, Junhua Shi, Guoqiang Feng, Chaoqun Liu, Penghua Quan, Hongyan Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China State Key Laboratory of Intelligent Manufacturing System Technology Beijing China Institute of Electronic System Engineering Beijing China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing China School of Computer Science and Technology East China Normal University Shanghai China

ISBN: (纸本)9781728194226

In order to make full use of the concept of model-based systems engineering (MBSE) and the collaborative design capability of the open model-based engineering environment (OpenMBEE) in establishing complex product development platform, we propose an effective method to solve the problem of unified identity authentication in OpenMBEE integration. The proposed method is based on the Model View Controller(MVC) architecture in OpenMBEE, which has the characteristics strong plasticity and can be benefit for expanding the function in the controller layer. In our research, we make full use of the Software Development Kit (SDK) of OpenMBEE to expand the existing functions in the controller layer, and increase the function of communicating with the application development platform, then realize the function of sharing user authentication information between the development platform and OpenMBEE. After expansion, the system includes three modules, including the Front-end Service Module(FSM), MQ based Information Receiving Service Module(IFRSM), and the OpenMBEE Back-end Server Module(BSM). The effectiveness of the proposed strategies is verified by some practical instances, which verifies that our study can provide an effective design idea for the identity authentication in OpenMBEE integration. ©2021 IEEE

关键词： Integration

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Modeling and simulation Method of Multi-element Electric Hydrogen Fusion System

Modeling and Simulation Method of Multi-element Electric Hyd...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Huaiguang Gu Jiapei Zhou Jin Li Dong Liu Danxi Liang Ji Li State Key Laboratory of Advanced Transmission Technology Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation Beijing China China Electric Power Research Institute Co. Ltd. Beijing China Electric Power Research Institute of State Grid Xinjiang Electric Power Co. Ltd. Urumqi

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

The comprehensive modeling and simulation method of multi-element electric hydrogen fusion system, are proposed in this paper. The corresponding control strategy for all the power electronic converters are designed to adapt the condition of power fluctuation and bi-directional energy flow. The typical energy and power flow mode of the system and the efficiency of the hydrogen production component are analyzed, which can be applied for the preliminary planning and design for this sort of integrated offshore clean energy system.

关键词： Green energy Adaptation models Hydrogen storage Hydrogen Production System integration Wind turbines Planning Transient analysis Load modeling

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Privacy Protection and Data Coordination Mechanism of Supply Chain Based on Blockchain 3

Privacy Protection and Data Coordination Mechanism of Supply...

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3rd International Conference on Applied Mathematics, Modelling, and Intelligent Computing, CAMMIC 2023

作者： Tang, Fei Lin, Jingwen Xing, Lili Yang, Xianggui He, Hao Ma, Shuai Huang, Dong School of Cyber Security and Information Law Chongqing University of Posts and Telecommunications Chongqing City400065 China Jiangxi Changhe Aviation Industries Co. Ltd. Jiangxi Province 333002 China Hunan Post And Telecommunication College Hunan Province 410015 China Key Laboratory of Advanced Manufacturing Technology of the Ministry of Education Guizhou University Guizhou402760 China

ISBN: (数字)9781510667617

ISBN: (纸本)9781510667600

With the rapid development of science and knowledge economy, traditional supply chain management has been unable to adapt to the ever-changing competitive environment. When a large amount of data is exchanged, it is easy to cause various privacy and security issues, and data between enterprises cannot be accurately shared. At the same time, there are still a lot of manual operations in each link, with long process delays and low efficiency. This paper proposes a blockchain-based supply chain privacy protection and data collaboration scheme. By using blockchain, data privacy and collaboration can be guaranteed based on a more accurate assessment of supplier capabilities. At the same time, this solution improves the efficiency of cooperation between enterprises more safely and reasonably, and makes the supply chain system circulate more smoothly. © 2023 SPIE.

关键词： Blockchain

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QFO-UCNN: Quantizable Feature Oriented Utilitarian Convolutional Neural Network for Sar Recognition

QFO-UCNN: Quantizable Feature Oriented Utilitarian Convoluti...

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IEEE International Conference on Network Infrastructure and Digital Content (IC-NIDC)

作者： Dejin Sun Anna Song Sijia Chen Lei Yang Zhiqi Li Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin China State Grid Cyber Security Technology (Beijing) CO. LTD Beijing China

Synthetic aperture radar (SAR) imagery is susceptible to the non-systematic motion error, which will defocus the data in the training set. Also, traditional convolutional neural networks (CNN) are random in the features utilized, many of which are useless for practical target recognition. To this end, quantizable feature oriented utilitarian CNN (QFO-UCNN) is proposed in this paper, where the defocusing can be alleviated via a quantizable entropy norm regularizer. To overcome the non-convexity of the optimization function, a tight surrogate function is designed to ensure the closed-form solution of the focusing feature. Besides, the dominant feature of sparsity is encoded by a l 1 norm, where the sparse feature is quantified via a closed-form soft-thresholding operator. In such cases, two useful features are quantified and constrained in the CNN, which improves the intentionality of the intended SAR target recognition. The canonical MSTAR dataset is employed to verify the effectiveness of the proposed algorithm, when the data encounters the non-systematic and multiplicative phase error.

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Sign-reversible valley-dependent Berry phase effects in 2D valley-half-semiconductors

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npj Computational Materials 2021年第1期7卷 1435-1441页

作者： Xiaodong Zhou Run-Wu Zhang Zeying Zhang Wanxiang Feng Yuriy Mokrousov Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of Technology100081 BeijingChina Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of Technology100081 BeijingChina College of Mathematics and Physics Beijing University of Chemical Technology100029 BeijingChina Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA52425 JülichGermany Institute of Physics Johannes Gutenberg University Mainz55099 MainzGermany

Manipulating valley-dependent Berry phase effects provides remarkable opportunities for both fundamental research and practical ***,by referring to effective model analysis,we propose a general scheme for realizing topological magneto-valley phase *** importantly,by using valley-half-semiconducting VSi2N4 as an outstanding example,we investigate sign change of valley-dependent Berry phase effects which drive the change-in-sign valley anomalous transport characteristics via external means such as biaxial strain,electric field,and correlation *** a result,this gives rise to quantized versions of valley anomalous transport *** findings not only uncover a general framework to control valley degree of freedom,but also motivate further research in the direction of multifunctional quantum devices in valleytronics and spintronics.

关键词： Berry phase reversible

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Microstructure Evolution and Mechanical Properties of a Novel High-Strength Ti2alnb Alloy Processed by Large-Strain Hot Extrusion

SSRN

引用

SSRN 2022年

作者： Liu, Shishuang Cao, Jingxia Zhou, Yi Hou, Chenrui Dai, Shenglong Huang, Xu Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials Beijing100095 China

The microstructure evolution and tensile behavior of a novel Ti2AlNb alloy (Ti-22Al-23Nb-1Mo-1Zr) processed by two-pass hot extrusion and two-step heat treatment were investigated. After extruding deformation in the B2 phase field, the B2 grains were refined from about 1500 μm to 50 μm through dynamic recrystallization. The microstructures subjected to solution treatment in the B2+α2 phase field and aging treatment in the B2+O phase field include B2 matrix, lamellar O, rim O and lamellar α2/O phases. The microstructure and tensile properties are sensitive to aging temperature. As the increase of the aging temperature, the content of the B2 phase and the size of the lamellar O phase increase, resulting in low strength and high ductility. The alloy aged at 800 oC has a good match of strength and ductility. It has an elongation of 6.4 % with a tensile strength as high as 1228 MPa due to the precipitation strengthening of numerous lamellar O phase and fine grain strengthening. The tensile fracture mode predominantly shows quasi-cleavage characteristics with typical cleavage facets and massive dimples, which is consistent with the good balance of tensile strength and ductility. An in-depth understanding of the relationship between microstructure and tensile properties in this study can be helpful for the engineering application of the Ti2AlNb alloy. © 2022, The Authors. All rights reserved.

关键词： Tensile strength

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Application of Fuzzy Interpolation Reasoning in Welding Process Decision 32nd

Application of Fuzzy Interpolation Reasoning in Welding Proc...

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32nd International Ocean and Polar Engineering Conference, ISOPE 2022

作者： Pan, Zufu Feng, Zhiqiang Qin, Haijian Jiao, Ziquan Yuan, Hao Li, Xin School of Mechamical Engineering Guangxi University Guangxi Nanning China Guangxi Engineering Technology Research Center of Ship Digital Design and Advanced Manufacturing Beibu Gulf University Guangxi Qinzhou China State Key Laboratory of Hydraulic Engineering Simulation & Safety Tianjin University Tianjin China

ISBN: (纸本)9781880653814

Welding is a highly nonlinear, time-varying and multi coupling typical complex process. When using the traditional fuzzy reasoning method to make decision on welding parameters, it is difficult to build an accurate and complete welding process parameter rule base due to the uncertainty and complexity of the welding process. When the given input value cannot match the rules in the rule base, the reasoning conclusion cannot be drawn. In order to solve this limitation, this paper proposes a welding process parameter decision-making method, which is achieved by fuzzy rule interpolation. It can predict and decide welding parameters when the welding process parameter rule base is sparse. The experimental results show that the model can achieve high accuracy. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Decision making

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First-principles study on Pr-doped Bilayer Nickelate La3Ni2O7

arXiv

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arXiv 2025年

作者： Huo, Zihao Zhang, Peng Shi, Haoliang Yan, Xiaochun Duan, Defang Cui, Tian Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China 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 Xi’an710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

Recently, the Pr-doped Ruddlesden-Popper phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and superconducting volume fraction of about 57 % at high pressure. However, the effect of Pr-doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and high pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may benefit for superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide helpful guide for understanding the effect of chemical pressure in isovalent doped RP phase nickelate superconductor. Copyright © 2025, The Authors. All rights reserved.

关键词： Superconducting transition temperature

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First-principles calculations on structural stability and electronic properties of nitrogen-doped lutetium hydrides under pressure

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Physical Review Research 2023年第4期5卷 043238-043238页

作者： Xiaokuan Hao Xudong Wei Hanyu Liu Xiaoxu Song Rongxin Sun Guoying Gao Yongjun Tian Center for High Pressure Science (CHiPS) State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao Hebei 066004 China Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics Jilin University Changchun 130012 China Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) International Center of Future Science Jilin University Changchun 130012 China

Since the discovery of superconductivity, the realization of room-temperature superconductivity has been the long dream of mankind. Recently, it has been reported that nitrogen-doped lutetium hydride has room-temperature superconductivity at near-ambient conditions. However, there is no solid evidence of such tantalizing superconductivity in nitrogen-doped lutetium hydride synthesized by follow-up experiments. The compositions and crystal structures of the nitrogen-doped lutetium hydride are still unclear. Therefore, we here systematically study the structural stability and electronic properties of Fm3¯m LuH3 and N-doped Fm3¯m LuH3, such as 1, 2, 3, 4, and 8% N, by first-principles calculations. Our further electronic properties calculations show that all the simulated Lu-N-H ternary compounds are metallic, except for a semiconducting phase of Lu4H11N (LuH2.75N0.25). Remarkably, the contribution of the H atoms to the electronic density of states at the Fermi level could be tuned by the increasing N concentration. Electron-phonon coupling calculations also show that both Fm3¯m LuH3 and Pm3¯m Lu4H11N are superconducting with critical temperature Tc's of 23 and 32 K at 24 and 60 GPa, respectively. Our current results suggest that LuH3 and N-doped LuH3 could be potential superconductors only at high pressure, while the estimated Tc values are much lower than room temperature.

关键词： Density of states First-principles calculations Superconductivity Crystal structures

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