检索结果-内蒙古大学图书馆

arXiv 2025年

作者： Li, Yi Xie, Zihan Yang, Xiaodong Li, Yue Zhao, Xingyu Cheng, Xu Peng, Xinhua Li, Jun Lutz, Eric Lin, Yiheng Du, Jiangfeng CAS Key Laboratory of Microscale Magnetic Resonance School of Physical Sciences University of Science and Technology of China Hefei230026 China Anhui Province Key Laboratory of Scientific Instrument Development and Application University of Science and Technology of China Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Shenzhen518045 China Institute for Theoretical Physics I University of Stuttgart StuttgartD-70550 Germany Institute of Quantum Sensing School of Physics Zhejiang University Hangzhou310027 China

Classical self-sustained oscillators, that generate periodic motion without periodic external forcing, are ubiquitous in science and technology. The realization of nonclassical self-oscillators is an important goal of quantum physics. We here present the experimental implementation of a quantum van der Pol oscillator, a paradigmatic autonomous quantum driven-dissipative system with nonlinear damping, using a single trapped atom. We demonstrate the existence of a quantum limit cycle in phase space in the absence of a drive and the occurrence of quantum synchronization when the nonlinear oscillator is externally driven. We additionally show that synchronization can be enhanced with the help of squeezing perpendicular to the direction of the drive and, counterintuitively, linear dissipation. We also observe the bifurcation to a bistable phase-space distribution for large squeezing. Our results pave the way for the exploration of self-sustained quantum oscillators and their application to quantum technology. Copyright © 2025, The Authors. All rights reserved.

关键词： Atoms

来源：评论

学校读者我要写书评

暂无评论

Tight tradeoff relation and optimal measurement for multi-parameter quantum estimation

arXiv

引用

arXiv 2025年

作者： Wang, Lingna Chen, Hongzhen Yuan, Haidong Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Shatin Hong Kong The Hong Kong Institute of Quantum Information Science and Technology The Chinese University of Hong Kong Shatin Hong Kong State Key Laboratory of Quantum Information Technologies and Materials The Chinese University of Hong Kong Shatin Hong Kong Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Guangdong Shenzhen China

The main challenge in multi-parameter quantum estimation lies in the incompatibility between optimal schemes for different parameters, which leads to nontrivial tradeoffs between the precision limits for estimating different parameters. Understanding and characterizing this tradeoff is essential in determining the ultimate precision limits in multi-parameter quantum estimation, making it a central topic in the field of quantum metrology. In this article, we present an approach that precisely quantifies the tradeoff resulting from incompatible optimal measurements in multi-parameter estimation. We derive a tight analytical tradeoff relation that determines the ultimate precision limits for estimating an arbitrary number of parameters encoded in pure quantum states. Additionally, we provide a systematic methodology for constructing optimal measurements that saturate this tight bound in an analytical and structured manner. To demonstrate the power of our findings, we applied our methodology to quantum radar, resulting in a refined Arthurs-Kelly relation that characterizes the ultimate performance for the simultaneous estimation of range and velocity. This showcases the transformative potential of our findings for many applications in quantum metrology. Copyright © 2025, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Investigating the interlayer electron transport and its in?uence on the whole electric properties of black phosphorus

引用

Science Bulletin 2019年第4期64卷 254-260页

作者： Bensong Wan Shaoqiang Guo Jiacheng Sun Yufei Zhang Yuyan Wang Caofeng Pan Junying Zhang Key Laboratory of Micro-nano Measurement Manipulation and Physics (Ministry of Education) School of Physics Beihang University CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences School of Nanoscience and Technology University of Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science and Technology Guangxi University College of Optoelectronic Engineering Shenzhen University

Two-dimensional(2D) nanomaterials have attracted great attention in next generation electronic and optoelectronic technologies due to the unique layered structure and excellent physical and chemical properties. However, the mechanism of transmission along the vertical direction of 2D semiconductor materials has not been investigated. Here, we use first-principles calculations to explore the bandgap energies along different directions, and fabricate a vertical, a lateral and a mixture-structured black phosphorus field effect transistor(BPFET) to study the electrical characteristics along different directions under variable temperatures. The variable temperature test indicates that the mixture-structured device performs more like a lateral device, while the conductance along the vertical direction is hard to be tuned by temperature and electrical field. The unchanged conductance under electric field and variable temperatures allows the vertical device to act as a fixed resistor, promising possible application for the prospective electronic and optoelectronic devices.

关键词： Black phosphorus Transistor Transmission Vertical Variable temperature

来源：评论

学校读者我要写书评

暂无评论

Intermediate anomalous Hall states induced by noncollinear spin structure in magnetic topological insulator MnBi2Te4

arXiv

引用

arXiv 2021年

作者： Fang, Jing-Zhi Wang, Shuo Ye, Xing-Guo Lin, Ben-Chuan Wang, An-Qi Cui, Hao-Nan Wang, Jian-Kun Zhu, Guang-Yu Liu, Song Li, Yongkai Wang, Zhiwei Yao, Yugui Wei, Zhongming Yu, Dapeng Liao, Zhi-Min Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100083 China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Beijing100871 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing100081 China Micronano Center Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing100081 China

The combination of topology and magnetism is attractive to produce exotic quantum matters, such as the quantum anomalous Hall state, axion insulators and the magnetic Weyl semimetals. MnBi2Te4, as an intrinsic magnetic topological insulator, provides a platform for the realization of various topological phases. Here we report the intermediate Hall steps in the magnetic hysteresis of MnBi2Te4, where four distinguishable magnetic memory states at zero magnetic field are revealed. The gate and temperature dependence of the magnetic intermediate states indicates the noncollinear spin structure in MnBi2Te4, which can be attributed to the Dzyaloshinskii-Moriya interaction as the coexistence of strong spin-orbit coupling and local inversion symmetry breaking on the surface. Moreover, these multiple magnetic memory states can be programmatically switched among each other through applying designed pulses of magnetic field. Our results provide new insights of the influence of bulk topology on the magnetic states, and the multiple memory states should be promising for spintronic devices. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic fields

来源：评论

学校读者我要写书评

暂无评论

Sensing With Random Communication Signals

arXiv

引用

arXiv 2025年

作者： Lu, Shihang Liu, Fan Xiong, Yifeng Du, Zhen Cui, Yuanhao Li, Shuangyang Yuan, Weijie Yang, Jie Jin, Shi National Mobile Communications Research Laboratory Southeast University Nanjing210096 China School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China School of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing210044 China Faculty of Electrical Engineering and Computer Science Technical University of Berlin Berlin10587 Germany Southern University of Science and Technology Shenzhen518055 China Frontiers Science Center for Mobile Information Communication and Security and also The Key Laboratory of Measurement and Control of Complex Systems of Engineering Southeast University Nanjing211189 China

Communication-centric Integrated Sensing and Communication (ISAC) has been recognized as a promising methodology to implement wireless sensing functionality over existing network architectures, due to its cost-effectiveness and backward compatibility to legacy cellular systems. However, the inherent randomness of the communication signal may incur huge fluctuations in sensing capabilities, leading to unfavorable detection and estimation performance. To address this issue, we elaborate on random ISAC signal processing methods in this article, aiming at improving the sensing performance without unduly deteriorating the communication functionality. Specifically, we commence by discussing the fundamentals of sensing with random communication signals, including the performance metrics and optimal ranging waveforms. Building on these concepts, we then present a general framework for random ISAC signal transmission, followed by an in-depth exploration of time-domain pulse shaping, frequency-domain constellation shaping, and spatial-domain precoding methods. We provide a comprehensive overview of each of these topics, including models, results, and design guidelines. Finally, we conclude this article by identifying several promising research directions for random ISAC signal transmission. © 2025, CC BY-SA.

关键词： Signaling

来源：评论

学校读者我要写书评

暂无评论

Progress of three-dimensional light-field display [Invited]

引用

Chinese Optics Letters 2019年第11期17卷 27-33页

作者： Qungang Ma Liangcai Cao Zehao He Shengdong Zhang School of Electronic and Computer Engineering Peking UniversityShenzhen 518055China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China

In this review, the principle and the optical methods for light-field display are introduced. The light-field display is divided into three categories, including the layer-based method, projector-based method, and integral imaging method. The principle, characteristic, history, and advanced research results of each method are also *** advantages of light-field display are discussed by comparing it with other display technologies including binocular stereoscopic display, volumetric three-dimensional display, and holographic display.

关键词： holographic light field

来源：评论

学校读者我要写书评

暂无评论

UPdec-Webb: A Dataset for Coaddition of JWST NIRCam Images

arXiv

引用

arXiv 2024年

作者： Wang, Lei Shan, Huanyuan Nie, Lin Cheng, Cheng Yuan, Fang-Ting Cui, Qifan Li, Guoliang Xie, Yushan Liu, Dezi Liu, Yao Fang, Min Li, Nan Jia, Peng Li, Ran Liu, Fengshan Shu, Yiping Jiang, Chang Wei, Cheng-Liang Qu, Han Zheng, Wen-Wen Zhu, Li-Yan Kang, Xi Purple Mountain Observatory Key Laboratory of Radio Astronomy Chinese Academy of Sciences 10 Yuanhua Road Qixia District Nanjing210023 China Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Key Laboratory of Radio Astronomy and Technology Chinese Academy of Sciences A20 Datun Road Chaoyang District Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China Department of Information Engineering Wuhan Institute of City Hubei Wuhan430083 China Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories CAS Beijing100101 China CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Key Laboratory of Space and Technology National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China South-Western Institute for Astronomy Research Yunnan University Yunnan Kunming650500 China National Astronomical Observatories Chinese Academy of Sciences Beijing100871 China College of Electronic Information and Optical Engineering Taiyuan030024 China Peng Cheng Lab Shenzhen518066 China Department of Physics Durham University DurhamDH1 3LE United Kingdom Zhejiang Provincial Key Laboratory of Quantum Precision Measurement College of Science Institute for Frontiers and Interdisciplinary Sciences Zhejiang University of Technology 288 Liuhe Road Hangzhou310023 China Zhejiang University Purple Mountain Observatory Joint Research Center for Astronomy Zhejiang University Hangzhou327 China

We present the application of the image coaddition algorithm, Up-sampling and PSF Deconvolution Coaddition (UPDC), for stacking multiple exposure images captured by the James Webb Space Telescope (JWST) Near-Infrared Camera (NIRCam). By addressing the point spread function (PSF) effect, UPDC provides visually enhanced and sharper images. Furthermore, the anti-aliasing and super-resolution capabilities of UPDC make it easier to deblend sources overlapped on images, yielding a higher accuracy of aperture photometry. We apply this algorithm to the SMACS J0723 imaging data. Comparative analysis with the Drizzle algorithm demonstrates significant improvements in detecting faint sources, achieving accurate photometry, and effectively deblending (super-resolution) closely packed sources. As a result, we have newly detected a pair of close binary stars that were previously unresolvable in the original exposures or the Drizzled image. These improvements significantly benefit various scientific projects conducted by JWST. The resulting dataset, named"UPdec-Webb", can be accessible through the official website of the Chinese Virtual Observatory (ChinaVO). © 2024, CC BY-NC-SA.

关键词： Space telescopes

来源：评论

学校读者我要写书评

暂无评论

A theranostic agent for cancer therapy and imaging in the second nearinfrared window

引用

Nano Research 2019年第2期12卷 273-279页

作者： Zhuoran Ma Hao Wan Weizhi Wang Xiaodong Zhang Takaaki Uno Qianglai Yang Jingying Yue Hongpeng Gao Yeteng Zhong Ye Tian Qinchao Sun Yongye Liang Hongjie Dai Department of Chemistry Stanford University Stanford CA 94305 USA CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology of China Beijing 100190 China Department of Physics and Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of Sciences Tianjin University Tianjin 300350 China JSR Corporation Advanced Materials Research Laboratories 100 Kawajiri-Cho Yokkaichi Mie 5108552 Japan Department of Materials Science and Engineering South University of Science and Technology of China Shenzhen 518055 China

Thera no stic nano particles are integrated systems useful for simulta neous diag nosis and imaging guided delivery of therapeutic drugs, with wide ranging pote ntial applicati ons in the clinic. Here we developed a thera no stic nan oparticle (~24 nm size by dynamic light scatteri ng) p-FE-PTX-FA based on polymeric micelle encapsulating an organic dye (FE) fluorescing in the 1,000-1,700 nm second near-infrared (NIR-Ⅱ) window and an an ti-ca ncer drug paclitaxel. Folic acid (FA) was conjugated to the nan oparticles to afford specific binding to molecular folate receptors on muri ne breast can cer 4T1 tumor cells. In vivo, the nan oparticles accumulated in 4T1 tumor through both passive and active targeting effect. Under an 808 nm laser excitation, fluorescence detection above 1,300 nm afforded a large Stokes shift, allowing targeted molecular imaging tumor with high signal to background ratios, reaching a high tumor to normal tissue signal ratio (T/NT) of (20.0±2.3). Further, 4T1 tumors on mice were completed eradicated by paclitaxel released from p-FE-PTA-FA within 20 days of the first injection. Pharmacokinetics and histology studies indicated p-FE-PTX-FA had no obvious toxic side effects to major organs. This represented the first NIR-Ⅱ theranostic age nt developed.

关键词： theranostic nanoparticles second near-infrared window fluorescenee imaging cancer therapy

来源：评论

学校读者我要写书评

暂无评论

Chiral Metal-Free Anti-Perovskite with Strong Chiroptical Nonlinearity

引用

Angewandte Chemie 2024年第6期137卷

作者： Zhaoyu Wang Xin Qiu Hebin Wang Wenkai Zhao Sehrish Gull Haolin Lu Zechen Hao Bing Sun Xin Zeng Prof. Xinfeng Liu Hao-Li Zhang Prof. Yongsheng Chen Prof. Tingchao He Prof. Guankui Long School of Materials Science and Engineering Tianjin Key Lab for Rare Earth Materials and Applications Smart Sensing Interdisciplinary Science Center Renewable Energy Conversion and Storage Center (RECAST) National Institute for Advanced Materials Nankai University Tianjin 300350 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China State Key Laboratory of Applied Organic Chemistry (SKLAOC) Key Laboratory of Special Function Materials and Structure Design (MOE) College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology Beijing 100190 China The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer Chemistry Renewable Energy Conversion and Storage Center (RECAST) College of Chemistry Nankai University Tianjin 300071 China

The nonlinear chiroptical properties of chiral metal halide perovskite has attracted substantial attention in recent years. In order to overcome the inherent limitations of metal halide, such as high costs, potential toxicity, challenges with recycling, especially the limited laser-induced damage threshold (LDT), we have successfully constructed the first chiral metal-free anti-perovskite, with the aim of utilizing it in second harmonic generation-circular dichroism (SHG-CD). Moreover, the anti-perovskite composed entirely of small organic ions typically display a more extensive transparent window, which could contribute a high LDT. Herein two chiral metal-free anti-perovskites, R / S -MCN [( R / S -MBA) 6 Cl(NH 4 Cl 6 )] were constructed, and exhibit strong second-harmonic generation response from 800 to 980 nm. The second-order nonlinear optical coefficient of the chiral metal-free anti-perovskite reaches 0.89 pm/V, which is higher than that of commercial Y-cut quartz. Most importantly, both R - and S -MCN exhibit a large nonlinear optical activity with a high SHG dissymmetry factor ( g SHG-CD ) of 0.60 and a high laser-induced damage threshold of 71 mJ/cm 2 , which is higher than that of most reported chiral perovskites. Our findings indicate that chiral metal-free anti-perovskite have the potential to be a valuable addition to the development of next-generation nonlinear chiroptical devices.

关键词： Chiral Anti-Perovskite Metal-Free Material Second-Harmonic Generation Laser-Induced Damage Threshold Nonlinear Chiroptics

来源：评论

学校读者我要写书评

暂无评论

Feasibility Study on A Multi-Dimensional Intelligent Perception Method of Electricity Stealing Situation 2020

Feasibility Study on A Multi-Dimensional Intelligent Percept...

引用

Proceedings of the 3rd International Conference on Information Technologies and Electrical engineering

作者： Xiangqi Xiao Rui Huang Maotao Yang Yanjiao Huang Wencheng Xiao Liang Yang State Grid Hunan Electric Power Company Limited Power Supply Service Center(Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China State Grid Hunan Electric Power Company Limited Power Supply Service Center (Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China State Grid Hunan management Training Center Changsha China China Resources Power Holdings Company Limited Shenzhen China Guangzhou Guangjian Construction Engineering Testing Center Co. Ltd. Guangzhou China

ISBN: (纸本)9781450388665

situational awareness technology can effectively improve the operational efficiency of grid and strongly guarantee the safe and stable operation of grid. Its important forecasting and decision support ability are indispensable parts of the smart grid. This article integrates a variety of professional systems, including power marketing system and power acquisition system, combines seasonal weather, social and economic information, and establishes a typical industry power consumption matrix data set and anti-electricity stealing diagnosis model, and proposes a multi-dimensional intelligent situational awareness solution of electricity stealing, which will improve the level of intelligent situational awareness of electricity stealing.

关键词： Electricity Stealing Feasibility Multi-dimensional

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：