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arXiv 2024年

作者： Li, Jiapeng Shao, Xiaodan Chen, Feng Wan, Shaohua Liu, Chang Wei, Zhiqiang Ng, Derrick Wing Kwan The College of Artificial Intelligence Southwest University Chongqing400715 China The Brain-Inspired Computing and Intelligent Control Key Laboratory Southwest University Chongqing400715 China The Key Laboratory of Luminescence Analysis and Molecular Sensing Southwest University Chongqing400715 China The Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518110 China The School of Mathematics and Statistics Xi'an Jiaotong University Xi'An710049 China The Peng Cheng Laboratory Guangdong Shenzhen518055 China Guangdong Guangzhou510555 China The Department of Computer Science and Information Technology La Trobe University MelbourneVIC3150 Australia The School of Electrical Engineering and Telecommunications University of New South Wales SydneyNSW2052 Australia

Integrated sensing and communication (ISAC) is envisioned as a key pillar for enabling the upcoming sixth generation (6G) communication systems, requiring not only reliable communication functionalities but also highly accurate environmental sensing capabilities. In this paper, we design a novel networked ISAC framework to explore the collaboration among multiple users for environmental sensing. Specifically, multiple users can serve as powerful sensors, capturing back scattered signals from a target at various angles to facilitate reliable computational imaging. Centralized sensing approaches are extremely sensitive to the capability of the leader node because it requires the leader node to process the signals sent by all the users. To this end, we propose a two-step distributed cooperative sensing algorithm that allows low-dimensional intermediate estimate exchange among neighboring users, thus eliminating the reliance on the centralized leader node and improving the robustness of sensing. This way, multiple users can cooperatively sense a target by exploiting the block-wise environment sparsity and the interference cancellation technique. Furthermore, we analyze the mean square error of the proposed distributed algorithm as a networked sensing performance metric and propose a beamforming design for the proposed network ISAC scheme to maximize the networked sensing accuracy and communication performance subject to a transmit power constraint. Simulation results validate the effectiveness of the proposed algorithm compared with the state-of-the-art algorithms. Copyright © 2024, The Authors. All rights reserved.

关键词： Beamforming

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A Generalization of Array Codes with Local Properties and Efficient Encoding/Decoding

arXiv

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arXiv 2021年

作者： Hou, Hanxu Han, Yunghsiang S. Lee, Patrick P.C. Wu, You Han, Guojun Blaum, Mario The School of Electrical Engineering & Intelligentization Dongguan University of Technology China The Shenzhen Institute for Advanced Study University of Electronic Science and Technology China Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong Beijing Didi Infinity Technology and Development Co. Ltd. China The School of Information Engineering Guangdong University of Technology China IBM Research Division-Almaden United States

An (n, k) recoverable property array code is composed of m × n arrays such that any k out of n columns suffice to retrieve all the information symbols, where n > k. Note that maximum distance separable (MDS) array code is a special (n, k) recoverable property array code of size m × n with the number of information symbols being km. Expanded-Blaum-Roth (EBR) codes and Expanded-Independent-Parity (EIP) codes are two classes of (n, k) recoverable property array codes that can repair any one symbol in a column by locally accessing some other symbols within the column, where the number of symbols m in a column is a prime number. By generalizing the constructions of EBR and EIP codes, we propose new (n, k) recoverable property array codes, such that any one symbol can be locally recovered and the number of symbols in a column can be not only a prime number but also a power of an odd prime number. Also, we present an efficient encoding/decoding method for the proposed generalized EBR (GEBR) and generalized EIP (GEIP) codes based on the LU factorization of a Vandermonde matrix. We show that the proposed decoding method has less computational complexity than existing methods. Furthermore, we show that the proposed GEBR codes have both a larger minimum symbol distance and a larger recovery ability of erased lines for some parameters when compared to EBR codes. We also present a necessary and sufficient condition of enabling EBR codes to recover any r erased lines of a slope for any parameter r, which was an open problem in [2]. Moreover, we show that EBR codes can recover any r consecutive erased lines of any slope for any parameter r. © 2021, CC BY.

关键词： Encoding (symbols)

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Faithful geometric measures for genuine tripartite entanglement

arXiv

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arXiv 2023年

作者： Ge, Xiaozhen Liu, Lijun Wang, Yong Xiang, Yu Zhang, Guofeng Li, Li Cheng, Shuming The Department of Control Science and Engineering Tongji University Shanghai201804 China Department of Applied Mathematics The Hong Kong Polytechnic University Hong Kong Department of Mathematics and Computer Science Shanxi Normal University Taiyuan030006 China State Key Laboratory for Mesoscopic Physics School of Physics Frontiers Science Center for Nano-optoelectronics Collaborative Innovation Center of Quantum Matter Peking University Beijing100871 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai201804 China Institute for Advanced Study Tongji University Shanghai200092 China

We present a faithful geometric picture for genuine tripartite entanglement of discrete, continuous, and hybrid quantum systems. We first show that the triangle relation (Formula Presented) holds for all subadditive bipartite entanglement measure E, all permutations under parties i, j, k, all α [0, 1], and all pure tripartite states. It provides a geometric interpretation that bipartition entanglement, measured by α, corresponds to the side of a triangle, of which the area with α (0, 1) is nonzero if and only if the underlying state is genuinely entangled. Then, we rigorously prove the non-obtuse triangle area with 0 1, and the triangle area is not a measure for any α > 1/2. Hence, our results are expected to aid significant progress in studying both discrete and continuous multipartite entanglement. Copyright © 2023, The Authors. All rights reserved.

关键词： Quantum entanglement

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Deep Learning Methods for Calibrated Photometric Stereo and Beyond

arXiv

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arXiv 2022年

作者： Ju, Yakun Lam, Kin-Man Xie, Wuyuan Zhou, Huiyu Dong, Junyu Shi, Boxin School of Electrical and Electronic Engineering Nanyang Technological University Singapore The Department of Electrical and Electronic Engineering The Hong Kong Polytechnic University Hong Kong The Research Institute for Future Media Computing Shenzhen University Shenzhen China The Department of Informatics University of Leicester Leicester United Kingdom The Faculty of Information Science and Engineering The Institute for Advanced Ocean Study Ocean University of China Qingdao China The National Key Laboratory for Multimedia Information Processing National Engineering Research Center of Visual Technology School of Computer Science Peking University Beijing China

Photometric stereo recovers the surface normals of an object from multiple images with varying shading cues, i.e., modeling the relationship between surface orientation and intensity at each pixel. Photometric stereo prevails in superior per-pixel resolution and fine reconstruction details. However, it is a complicated problem because of the non-linear relationship caused by non-Lambertian surface reflectance. Recently, various deep learning methods have shown a powerful ability in the context of photometric stereo against non-Lambertian surfaces. This paper provides a comprehensive review of existing deep learning-based calibrated photometric stereo methods utilizing orthographic cameras and directional light sources. We first analyze these methods from different perspectives, including input processing, supervision, and network architecture. We summarize the performance of deep learning photometric stereo models on the most widely-used benchmark data set. This demonstrates the advanced performance of deep learning-based photometric stereo methods. Finally, we give suggestions and propose future research trends based on the limitations of existing models. Copyright © 2022, The Authors. All rights reserved.

关键词： Light sources

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Polarization entanglement enabled by orthogonally stacked van der Waals NbOCl2 crystals

arXiv

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arXiv 2024年

作者： Guo, Qiangbing Wu, Yun-Kun Zhang, Di Zhang, Qiuhong Guo, Guang-Can Alù, Andrea Ren, Xi-Feng Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Centre for Advanced 2D Materials Graphene Research Centre National University of Singapore Singapore Singapore CAS Key Laboratory of Quantum Information CAS Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei China Hefei National Laboratory University of Science and Technology of China Hefei China Photonics Initiative Advanced Science Research Center City University of New York New York United States Physics Program Graduate Center City University of New York New York United States The Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics TEDA Applied Physics Institute Nankai University Tianjin China School of Chemistry and Materials Science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou China

Polarization entanglement holds significant importance for photonic quantum technologies. Recently emerging subwavelength nonlinear quantum light sources, e.g., GaP and LiNbO3 thin films, benefiting from the relaxed phase-matching constraints and volume confinement, has shown intriguing properties, such as high-dimensional hyperentanglement and robust entanglement anti-degradation. Van der Waals (vdW) NbOCl2 crystal, renowned for its superior optical nonlinearities, has emerged as one of ideal candidates for ultrathin quantum light sources [Nature 613, 53 (2023)]. However, polarization-entanglement is inaccessible in NbOCl2 crystal due to its unfavorable nonlinear susceptibility tensor. Here, by leveraging the twist-stacking degree of freedom inherently in vdW systems, we showcase the preparation of tunable polarization entanglement and quantum Bell states. Our work not only provides a new and tunable polarization-entangled vdW photon-pair source, but also introduces a new knob in engineering the entanglement state of quantum light at the nanoscale. © 2024, CC BY-NC-ND.

关键词： Van der Waals forces

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Tuning nonlinear second-harmonic generation in AlGaAs nanoantennas via chalcogenide phase change material

arXiv

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arXiv 2021年

作者： Liu, Tingting Fang, Xinyuan Xiao, Shuyuan Institute of Photonic Chips University of Shanghai for Science and Technology Shanghai200093 China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China Institute for Advanced Study Nanchang University Nanchang330031 China Jiangxi Key Laboratory for Microscale Interdisciplinary Study Nanchang University Nanchang330031 China

The ability to engineer nonlinear optical processes in all-dielectric nanostructures is both of fundamental interest and highly desirable for high-performance, robust, and miniaturized nonlinear optical devices. Herein, we propose a novel paradigm for the efficient tuning of second-harmonic generation (SHG) process in dielectric nanoantennas by integrating with chalcogenide phase change material. In a design with Ge2Sb2Te5 (GST) film sandwiched between the AlGaAs nanoantennas and AlOx substrate, the nonlinear SHG signal from the AlGaAs nanoantennas can be boosted via the resonantly localized field induced by the optically-induced Mie-type resonances, and further modulated by exploiting the GST amorphous-to-crystalline phase change in a non-volatile, multilevel manner. The tuning strategy originates from the modulation of resonant conditions by changes in the refractive index of GST. With a thorough examination of tuning performances for different nanoantenna radii, a maximum modulation depth as high as 540% is numerically demonstrated. This work not only reveals out the potential of GST in optical nonlinearity control, but also provides promising strategy in smart designing tunable and reconfigurable nonlinear optical devices, e.g., light emitters, modulators, and sensors. Copyright © 2021, The Authors. All rights reserved.

关键词： Refractive index

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Self-locked optical parametric oscillation in a highly doped silica glass slot ring resonator 26

Self-locked optical parametric oscillation in a highly doped...

引用

26th Optoelectronics and Communications Conference, OECC 2021

作者： Li, Guangkuo Li, Yuhua Li, Qian Wang, Shao Hao Zhu, Xiaotian Davidson, Roy Little, Brent E. Chu, Sai T. Department of Physics City University of Hong Kong Kowloon Tong Hong Kong Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou China School of Electronic and Computer Engineering Peking University Shenzhen China Department of Microelectronics Science and Technology Fuzhou University Qi Shan Campus Fuzhou China QXP Technology Inc. Xi'an China State Key Laboratory of Transient Optics and Photonics XIOPM CAS Xi'an China

ISBN: (纸本)9781557528209

关键词： Glass

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Exploring nontrivial topology at quantum criticality in a superconducting processor

arXiv

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arXiv 2025年

作者： Tan, Ziqi Wang, Ke Yang, Sheng Shen, Fanhao Jin, Feitong Zhu, Xuhao Ji, Yujie Xu, Shibo Chen, Jiachen Wu, Yaozu Zhang, Chuanyu Gao, Yu Wang, Ning Zou, Yiren Zhang, Aosai Li, Tingting Bao, Zehang Zhu, Zitian Zhong, Jiarun Cui, Zhengyi Han, Yihang He, Yiyang Wang, Han Yang, Jianan Wang, Yanzhe Shen, Jiayuan Liu, Gongyu Song, Zixuan Deng, Jinfeng Dong, Hang Zhang, Pengfei Jian, Shao-Kai Li, Hekang Wang, Zhen Guo, Qiujiang Lin, Hai-Qing Song, Chao Yu, Xue-Jia Wang, H. Wu, Fei College of Computer Science and Technology Zhejiang University Hangzhou310027 China School of Physics ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control Zhejiang University Hangzhou310000 China Institute for Advanced Study in Physics School of Physics Zhejiang University Hangzhou310058 China Department of Physics and Engineering Physics Tulane University New OrleansLA70118 United States Hefei National Laboratory Hefei230088 China Department of Physics Fuzhou University Fujian Fuzhou350116 China Fujian Key Laboratory of Quantum Information and Quantum Optics College of Physics and Information Engineering Fuzhou University Fujian Fuzhou350108 China

The discovery of nontrivial topology in quantum critical states has introduced a new paradigm for classifying quantum phase transitions and challenges the conventional belief that topological phases are typically associated with a bulk energy gap. However, realizing and characterizing such topologically nontrivial quantum critical states with large particle numbers remains an outstanding experimental challenge in statistical and condensed matter physics. Programmable quantum processors can directly prepare and manipulate exotic quantum many-body states, offering a powerful path for exploring the physics behind these states. Here, we present an experimental exploration of the critical cluster Ising model by preparing its low-lying critical states on a superconducting processor with up to 100 qubits. We develop an efficient method to probe the boundary g-function based on prepared low-energy states, which allows us to uniquely identify the nontrivial topology of the critical systems under study. Furthermore, by adapting the entanglement Hamiltonian tomography technique, we recognize two-fold topological degeneracy in the entanglement spectrum under periodic boundary condition, experimentally verifying the universal bulk-boundary correspondence in topological critical systems. Our results demonstrate the low-lying critical states as useful quantum resources for investigating the interplay between topology and quantum criticality. Copyright © 2025, The Authors. All rights reserved.

关键词： Topology

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Phase engineering of giant second harmonic generation in Bi2O2Se

arXiv

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arXiv 2024年

作者： Lou, Zhefeng Zhao, Yingjie Gong, Zhihao Zhu, Ziye Wu, Mengqi Wang, Tao Wang, Jialu Qi, Haoyu Zuo, Huakun Xu, Zhuokai Shen, Jichuang Wang, Zhiwei Li, Lan Xu, Shuigang Kong, Wei Li, Wenbin Zheng, Xiaorui Wang, Hua Lin, Xiao Key Laboratory for Quantum Materials of Zhejiang Province Department of Physics School of Science Research Center for Industries of the Future Westlake University Hangzhou310030 China School of Physics Zhejiang University Zhejiang Province Hangzhou310027 China Institute of Natural Sciences Westlake Institute for Advanced Study Hangzhou310024 China Key Laboratory of 3D Micro/nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Zhejiang Province Hangzhou310024 China ZJU-Hangzhou Global Scientific and Technological Innovation Center School of Physics Zhejiang University Hangzhou311215 China Academy of Interdisciplinary Studies on Intelligent Molecules Tianjin Key Laboratory of Structure and Performance for Functional Molecules College of Chemistry Tianjin Normal University Tianjin300387 China Hangzhou Key Laboratory of Quantum Matters School of Physics Hangzhou Normal University Hangzhou311121 China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314011 China Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing100081 China Center for Quantum Matter Zhejiang University Hangzhou310058 China

Two-dimensional (2D) materials with remarkable second-harmonic generation (SHG) hold promise for future on-chip nonlinear optics. Relevant materials with both giant SHG response and environmental stability are long-sought targets. Here, we demonstrate the enormous SHG from the phase engineering of a high-performance semiconductor, Bi2O2Se (BOS), under uniaxial strain. SHG signals captured in strained 20 nm-BOS films exceed those of NbOI2 and NbOCl2 of similar thickness by a factor of 10, and are four orders of magnitude higher than monolayer-MoS2, resulting in a significant second-order nonlinear susceptibility on the order of 1 nm V-1. Intriguingly, the strain enables continuous adjustment of the ferroelectric phase transition across room temperature. Consequently, an exceptionally large tunability of SHG, approximately six orders of magnitude, is achieved through strain or thermal modulation. This colossal SHG, originating from the geometric phase of Bloch wave functions and coupled with sensitive tunability through multiple approaches in this air-stable 2D semiconductor, opens new possibilities for designing chip-scale, switchable nonlinear optical devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Harmonic generation

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A multimodal deep learning approach for very short-term solar forecasts using sky images and historical numerical data

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Renewable Energy 2025年 255卷

作者： Anto Leoba Jonathan Olusola Bamisile Dongsheng Cai Chukwuebuka Joseph Ejiyi Joseph Junior Nkou Nkou Kombou Victor Chiagoziem C. Ukwuoma Liu Wei Qi Huang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan P.R. 610059 China Sichuan Engineering Technology Research Center for Industrial Internet Intelligent Monitoring and Application Chengdu University of Technology Sichuan P.R. 610059 China Energy Environment and Society Division University of Dundee United Kingdom School of Computer Science and Engineering (School of Cyber Security) Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China (UESTC) Chengdu 611731 China

The increased solar energy integration into the power system introduces various issues due to its intermittent nature. As solar power penetration increases, grid management becomes increasingly complex, highlighting the importance of precise solar power forecasts. This paper addresses a critical challenge in solar power integration, highlighting the significance of very short-term solar forecasting (VSTSF) for grid operators. We propose a novel MULSKIN hybrid framework that combines a custom ResNet and a novel targeted feature attention mechanism (TFAM), which dynamically focuses on the most relevant regions in sky images, improving the model's ability to capture essential cloud dynamics and spatiotemporal patterns. Unlike existing methods in literature that either use image (sky images) or numerical (meteorological) data, the proposed MULSKIN approach integrates both data types, allowing for a more holistic understanding of atmospheric conditions. This paper contributes to advancing the field of solar forecasting by presenting a new, effective, and scalable solution suitable for operational deployment in modern energy systems. With six years of high-resolution data, the model outperforms traditional machine learning (ML), deep learning (DL) models, and baseline reference models, achieving a forecast skill score of 32.84 % and a root mean square error (RMSE) of 54.36W/m 2 . Our Results indicate that incorporating sky images alongside numerical meteorological data significantly enhances forecasting accuracy, with the MULSKIN model demonstrating its superiority in capturing dynamic cloud movements and weather patterns over short time horizons. The findings underscore the potential of combining multimodal data sources to address the challenges of VSTSF, offering promising improvements in solar irradiance prediction for real-time grid operations.

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