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Robust twin-field quantum key distribution through sending or not sending

National science Review 2023年第4期10卷 76-85页

作者： Cong Jiang Zong-Wen Yu Xiao-Long Hu Xiang-Bin Wang Jinan Institute of Quantum Technology State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Data Communication Science and Technology Research Institute School of Physics State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University Shanghai Branch CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shenzhen Institute for Quantum Science and Engineering and Physics Department Southern University of Science and Technology Frontier Science Center for Quantum Information

The sending-or-not-sending(SNS) protocol is one of the most major variants of the twin-field(TF)quantum key distribution(QKD) protocol and has been realized in a 511-km field fiber, the farthest field experiment to date. In practice, however, all decoy-state methods have unavoidable source errors, and the source errors may be non-random, which compromises the security condition of the existing TF-QKD protocols. In this study, we present a general approach for efficiently calculating the SNS protocol's secure key rate with source errors, by establishing the equivalent protocols through virtual atenuation and the tagged model. This makes the first result for TF QKD in practice where source intensity cannot be controlled exactly. Our method can be combined with the two-way classical communication method such as active odd-parity pairing to further improve the key rate. The numerical results show that if the intensity error is within a few percent, the key rate and secure distance only decrease marginally. The key rate of the recent SNS experiment in the 511-km field fiber is still positive using our method presented here, even if there is a ±9.5% intensity fluctuation. This shows that the SNS protocol is robust against source errors.

关键词： quantum information quantum key distribution sending or not sending twin field source error

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Directional Antenna UAVs Networking Algorithm Based on On-Demand-Weighted Clustering 22

Directional Antenna UAVs Networking Algorithm Based on On-De...

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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Zheng, Ruoqi Zhang, Qi Xin, Xiangjun Zhao, Tonggang Chai, Furong Tian, Feng Wang, Fu Tian, Qinghua Yang, Leijing Li, Yuanfeng Sun, Meng Wang, Yongjun Beijing100876 China BUPT Beijing Key Laboratory of Space-ground Interconnection and Convergence Beijing100876 China National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha410073 China School of Information and Electronics Beijing Institute of Technology Beijing100081 China

To solve the problem of cluster configuration for unmanned aerial vehicle (UAV) networks in highly dynamic environments, a directional antenna UAVs network algorithm based on demand-weighted clustering is proposed to ... 详细信息

ISBN: (纸本)9798350367652

关键词： Unmanned aerial vehicles (UAV)

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Collaboratively enhancing electrochemical properties of LiNi_(0.83)Co_(0.11)Mn_(0.06)O_(2) through doping and coating of quadrivalent elements

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Rare Metals 2023年第12期42卷 4103-4114页

作者： Zhao-Zhe Yu Gui-Quan Zhao Fang-Li Ji Hao Tong Qi-Lin Tong Hua-Cheng Li Yan Cheng Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology Guilin University of Electronic TechnologyGuilin 541004China Engineering Research Center of Electronic Information Materials and Devices Ministry of EducationGuilin University of Electronic TechnologyGuilin 541004China Guangxi CNGR New Energy Science&Technology Co. Ltd.Qinzhou 535000China

Ni-rich layered oxides(Ni>80%)with high energy density have become a mainstream cathode material for Li-ion ***,irreversible phase transitions and interface instability are deep-seated challenges in commercializing Ni-rich *** study used a collaborative modification strategy involving doping and coating with quadrivalent elements to construct Ni-rich *** particular,introducing tetravalent Zr makes the valence change of Ni(2+to 4+)more accessible to complete spontaneously during the charging and discharging processes,which significantly suppresses the cationic mixing and irreversible phase transition(H2?H3).Combining the strategy of constructing CeO_(2) coatings on the surface and interfacial spinel-like phases improves the Li+diffusion kinetics and interfacial ***,part of the strongly oxidizing four-valence Ce^(4+)diffuses to the surface layer,further increasing the average valence state of ***,LiNi_(0.83)Co_(0.11)Mn_(0.06)O_(2)(NCM)-Zr@Ce achieves 78.5%outstanding retention at1.0C after 200 cycles within 3.0-4.3 V compared to unmodified NCM with 41.4%*** improved cyclic stability can be attributed to the collaborative modification strategy of the quadrivalent elements,which provides an effective synergistic modification strategy for developing high-performance Li-ion battery cathode materials.

关键词： Collaborative modification strategy Quadrivalent elements Phase transitions Structural degradation Ni-rich layered oxides

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Adaptive Tracking Algorithm for Hypersonic Maneuvering Target Based on Bi-satellite Positioning

Adaptive Tracking Algorithm for Hypersonic Maneuvering Targe...

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2024 China Automation Congress, CAC 2024

作者： Fu, Zhumu Wan, Dongfeng Wang, Zhikai Tao, Fazhan School Information Engineering Henan University of Science and Technology National Key Laboratory of Air-based Information Perception and Fusion Luoyang China

ISBN: (纸本)9798350368604

Due to the hypersonic maneuvering target’s fast flight speed and wide trajectory range, it is impractical to track its entire path using ground-based radar. Based on the Bi-satellite positioning measurement model with line of sight intersection, this paper integrate the Strong Tracking Filter (STF) with the Unscented Kalman Filter (UKF) algorithm, incorporating two adaptive coefficients to adjust the filter gain and noise covariance matrix dynamically. This approach aims to track and estimate the trajectory of a hypersonic glide vehicles (HGVs) based on observations from two LEO early warning satellites within the space-based infrared system. Through simulation, this paper presents the results of tracking target trajectories using an adaptive strong tracking Unscented Kalman Filter (ASTUKF) algorithm based on Bi-satellite positioning. The simulation and experimental results demonstrate that the proposed algorithm achieves a 28.95% and 50.36% lower total speed RMSE compared to the other two algorithms, respectively. Similarly, the total position RMSE is reduced by 30.46% and 51.99%, respectively, when compared with the same algorithms. © 2024 IEEE.

关键词： Kalman filters

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Radar Probing Optimization for Joint Beamforming and UAV Trajectory Design in UAV-Enabled Integrated Sensing and Communication

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IEEE Transactions on Communications 2024年第6期73卷 4469-4485页

作者： Liu, Yaxi Mao, Wencan He, Boxin Huangfu, Wei Huang, Tianyao Zhang, Haijun Long, Keping University Of Science And Technology Beijing Beijing Advanced Innovation Center For Materials Genome Engineering Beijing Engineering And Technology Research Center For Convergence Networks And Ubiquitous Services School Of Computer And Communication Engineering Beijing100083 China University Of Science And Technology Shunde Innovation School Beijing China National Institute Of Informatics Information Systems Architecture Science Research Division Tokyo101-8430 Japan

Unmanned aerial vehicle (UAV)-enabled massive multiple-input-multiple-output (MIMO) integrated sensing and communication (ISAC) is an emerging platform to perform communication and sensing efficiently and flexibly. However, the existing works barely consider the radar probing tasks and neglect the benefits of the dedicated sensing signal. In this paper, we focus on joint optimizations in radar probing tasks, and a novel indicator is introduced, namely radar probing error. Two optimizations in radar probing tasks are established: i) joint transmit beamforming design for large-scale regional radar probing and communication task;ii) joint transmit beamforming and UAV trajectory design for communication enhancement and radar probing task. For the former task, we adopt both communication and novel sensing precoders to further support the MIMO radar. A semidefinite relaxation is utilized to relax the original non-convex problem, which is proven to be tight. For the latter task, we adopt block coordinate descent to alternately optimize the precoders and UAV trajectory where the fractional programming approach and successive convex approximation are further adopted. Experiment results testify the validation of the proposed methods for radar probing tasks in UAV-enabled MIMO ISAC. Moreover, results show the fundamental trade-off between the dual functions and reveal the effectiveness of the introduced sensing precoder. © 1972-2012 IEEE.

关键词： Unmanned aerial vehicles (UAV)

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Joint self-supervised and reference-guided learning for depth inpainting

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Computational Visual Media 2022年第4期8卷 597-612页

作者： Heng Wu Kui Fu Yifan Zhao Haokun Song Jia Li State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijing 100191China

Depth information can benefit various computer vision tasks on both images and ***,depth maps may suffer from invalid values in many pixels,and also large *** improve such data,we propose a joint self-supervised and reference-guided learning approach for depth *** the self-supervised learning strategy,we introduce an improved spatial convolutional sparse coding module in which total variation regularization is employed to enhance the structural information while preserving edge *** module alternately learns a convolutional dictionary and sparse coding from a corrupted depth ***,both the learned convolutional dictionary and sparse coding are convolved to yield an initial depth map,which is effectively smoothed using local contextual *** reference-guided learning part is inspired by the fact that adjacent pixels with close colors in the RGB image tend to have similar depth *** thus construct a hierarchical joint bilateral filter module using the corresponding color image to fill in large *** summary,our approach integrates a convolutional sparse coding module to preserve local contextual information and a hierarchical joint bilateral filter module for filling using specific adjacent *** results show that the proposed approach works well for both invalid value restoration and large hole inpainting.

关键词： depth inpainting self-supervised learning reference-guided learning

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Regulating Effect of Substrate Temperature on Sputteringgrown Ge/Si QDs under Low Ge Deposition

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Journal of Wuhan University of technology(Materials science) 2024年第4期39卷 888-894页

作者：舒启江 YANG Linjing LIU Hongxing 黄鹏儒 Institute of Information Yunnan University of Chinese MedicineKunming 650500China Guangxi Key Laboratory of Information Materials and Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science&EngineeringGuilin University of Electronic TechnologyGuilin 541004China

The effect of deposition temperature on the morphology and optoelectronic performance of Ge/Si QDs grown by magnetron sputtering under low Ge deposition(~4 nm)was investigated by atomic force microscopy,Raman spectroscopy,and photoluminescence(PL)*** experimental results indicate that temperatures higher than 750℃effectively increase the crystallization rate and surface smoothness of the Si buffer layer,and temperatures higher than 600℃significantly enhance the migration ability of Ge atoms,thus increasing the probability of Ge atoms meeting and nucleating to form QDs on Si buffer layer,but an excessively high temperature will cause the QDs to undergo an Ostwald ripening process and thus develop into super large *** addition,some PL peaks were observed in samples containing small-sized,high-density Ge QDs,the photoelectric properties reflected by these peaks were in good agreement with the corresponding structural characteristics of the grown *** results demonstrate the viability of preparing high-quality QDs by magnetron sputtering at high deposition rate,and the temperature effect is expected to work in conjunction with other controllable factors to further regulate QD growth,which paves an effective way for the industrial production of QDs that can be used in future devices.

关键词： Ge/Si QDs deposition temperatures evolution law photoelectric performance

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A healable, mechanically robust and ultrastretchable ionic conductive elastomer for durably wearable sensor

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Nano Research 2024年第4期17卷 3369-3378页

作者： Guoxian Zhang Chunmei Li JiaoJun Tan Mingqi Wang Yafeng Ren Feijie Ge Qiuyu Zhang Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science&TechnologyXi’an 710021China

The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical *** ionic conductive elastomers integrating non-volatility,mechanical robustness,superior ionic conductivity,and ultra-stretchability remains urgent and ***,we developed a healable,robust,and conductive elastomer via impregnating free ionic liquids(ILs)into the ILs-multigrafted poly(urethane-urea)(PUU)elastomer networks.A crucial strategy in the molecular design is that imidazolium cations are largely introduced by double-modification of PUU and centipede-like structures are obtained,which can lock the impregnated ILs through strong ionic *** this system,the PUU matrix contributes outstanding mechanical properties,while the hydrogen bonds and ionic interactions endow the elastomer with self-healing ability,conductivity,as well as non-volatility and *** fabricated ionic conductive elastomers show good conductivity(3.8×10^(-6) S·cm^(-1)),high mechanical properties,including tensile stress(4.64 MPa),elongation(1470%),and excellent healing ability(repairing efficiency of 90%after healing at room temperature for 12 h).Significantly,the conductive elastomers have excellent antifatigue properties,and demonstrate a highly reproducible response after 1000 uninterrupted extension-release *** work provides a promising strategy to prepare ionic conductive elastomers with excellent mechanical properties and stable sensing capacity,and further promote the development of mechanically adaptable intelligent sensors.

关键词： ionic conductive elastomers poly(urethane-urea)(PUU) ionic interactions centipede-like self-healing

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Optimization of radio-over-fiber links with dispersion-induced power fading compensation and tunable carrier-to-sideband ratio technology 14

Optimization of radio-over-fiber links with dispersion-induc...

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Advanced Sensor systems and Applications XIV 2024

作者： Li, Yueqin Peng, Chenyu Wang, Qian Luo, Runqing Sun, Jian Qin, Jun Miao, Min Key Laboratory of Information and Communication Systems Ministry of Information Industry Beijing Information Science and Technology University 55 Taihang Road Changping District Beijing102206 China Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology University 55 Taihang Road Changping District Beijing102206 China

ISBN: (纸本)9781510682146

High-quality radio-over-fiber (RoF) links are desired for wireless communication and radar systems. To address challenges of power fading induced by dispersion in fiber transmission, and the decreasing sensitivity caused by large carrier-tosideband ratio (CSR), we propose a double-sideband-modulation analog photonic link featuring power fading compensation and tunable optical CSR based on a dual-parallel polarization modulator. Through adjustment of the direct current bias voltage, dynamic compensation of dispersion-induced power fading at the working frequency can be achieved. The simulation results show successful compensation of power fading over fiber transmission distances of 25 and 40 km. In addition, the tunable optical CSR ranging from -60 dB to 60 dB is attained by tuning the polarization angle before the modulator, providing the flexibility of optimizing the RoF link performance by adjusting the optimal CSR. © 2024 SPIE.

关键词： Radio-over-fiber

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S2Gait: RGB-based Gait Recognition with Style Feature Sampling Data Augmentation

S2Gait: RGB-based Gait Recognition with Style Feature Sampli...

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2025 IEEE/SICE International Symposium on System Integration, SII 2025

作者： Yoshino, Koki Nakashima, Kazuto Ahn, Jeongho Iwashita, Yumi Kurazume, Ryo Kyushu University Graduate School of Information Science and Electrical Engineering Japan Kyushu University Faculty of Information Science and Electrical Engineering Japan California Institute of Technology Jet Propulsion Laboratory United States

ISBN: (纸本)9798331531614

Gait is unique to individuals and can be acquired from a distance, making it difficult to disguise. Gait videos also contain many elements unrelated to gait, which make gait recognition challenging. Departing from common approaches that use preprocessing such as silhouette extraction, the RGB-based method extracts gait features directly from RGB gait videos. RGB-based methods leverage the difference between two inputs with different attributes to separate gait-related/unrelated features, but their separation performance depends on the diversity of the dataset. To increase the amount and diversity of training data, we focus on the latent space of gait-independent features (style features), which are usually not needed for gait recognition. In this paper, we propose S2Gait (Style feature Sampling Gait), which augments the training data online with images generated from gait-dependent features of the input images and sampled style features. Experiments demonstrate that the proposed method surpasses existing RGB-based methods on almost all metrics for both generated image quality and identification accuracy. We also explore the relationship between the amount of data augmentation and performance taking advantage of our method's flexibility to generate a wide variety of gait images. © 2025 IEEE.

关键词： RGB color model

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