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Side-channel free quantum digital signature with source monitoring

Chinese Physics B 2025年第1期34卷 53-58页

作者： Luo-Jia Ma Ming-Shuo Sun Chun-Hui Zhang Hua-Jian Ding Xing-Yu Zhou Jian Li Qin Wang Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China Broadband Wireless Communication and Sensor Network Technology Key Laboratory of Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China

Quantum digital signature(QDS)can guarantee the information-theoretical security of a signature with the fundamental laws of quantum ***,most current QDS protocols do not take source security into account,leading to an overestimation of the signature *** this paper,we propose to utilize Hong–Ou–Mandel interference to characterize the upper bound of the source imperfections,and further to quantify information leakage from potential ***,we combine decoy-state methods and finite-size analysis in analyzing the signature *** results demonstrate the performance and feasibility of our *** current work can improve the practical security of QDS systems,thereby promoting their further networked applications.

关键词： Hong-Ou-Mandel interference side-channel free quantum digital signature

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Improved reference-frame-independent quantum key distribution with intensity fluctuations

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Chinese Physics B 2025年第2期34卷 48-52页

作者： Zi-Qi Chen Hao-Bing Sun Ming-Shuo Sun Qin Wang Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China Broadband Wireless Communication and Sensor Network Technology Key Laboratory of Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China

Reference-frame-independent quantum key distribution(RFI-QKD) can avoid real-time calibration operation of reference frames and improve the efficiency of the communication process. However, due to imperfections of optical devices,there will inevitably exist intensity fluctuations in the source side of the QKD system, which will affect the final secure key rate. To reduce the influence of intensity fluctuations, an improved 3-intensity RFI-QKD scheme is proposed in this *** considering statistical fluctuations and implementing global parameter optimization, we conduct corresponding simulation analysis. The results show that our present work can present both higher key rate and a farther transmission distance than the standard method.

关键词： quantum key distribution intensity fluctuations decoy-state method

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Large-Scale Traffic Flow Forecast with Lightweight LLM in Edge Intelligence

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IEEE Internet of Things Magazine 2025年第1期8卷 12-18页

作者： Rong, Yi Mao, Yingchi He, Xiaoming Chen, Mingkai College of Computer and Software Hohai University China College of Internet of Things Nanjing University of Posts and Telecommunications China Nanjing University of Posts and Telecommunications Laboratory of Broadband Wireless Communication and Sensor Network Technology China

Large-scale traffic flow forecasting affiliated with the time is valuable for the management in Intelligent Transportation Systems (ITS). Recently, Large Language Models (LLMs) have shown the prominence on this issue. Unfortunately, the existing LLMs cannot forecast the entire road network, including two problems, i.e., (1) training the large-scale data generated by a road network on the central cloud can impose computational pressure. (2) LLMs fail to capture the spatiotemporal correlations in the road network. To overcome the challenges, we propose a novel architecture named Light-weight Spatio-temporal Generative Large Language Model on Edges (LSGLLM-E). Specifically, we first decompose the entire large-scale road network into several subparts, and deploy the Rode-side Unit (RSU) as an edge on each subpart, thus avoiding the computational pressure on the central cloud. In addition, we design an LLM-based method named Light-weight Spatio-temporal Generative Large Language Model (LSGLLM) to extract the spatiotemporal correlations, which compensates for the lack of spatiotemporal features. Finally, the experimental results illustrate that the LSGLLM-E is superior to some advanced baselines in terms of the accuracy and efficiency of the prediction. © 2025 IEEE.

关键词： Roads Cloud computing Correlation Training Predictive models Time series analysis Forecasting Edge computing Large language models Feature extraction

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A teacher-student based attention network for fine-grainedimage recognition

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Digital communications and networks 2025年第1期11卷 52-59页

作者： Ang Li Xueyi Zhang Peilin Li Bin Kang Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education) Nanjing University of Posts and TelecommunicationsNanjing210003China School of Communications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing210003China School of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing210003China

Fine-grained Image Recognition(FGIR)task is dedicated to distinguishing similar sub-categories that belong to the same super-category,such as bird species and car *** order to highlight visual differences,existing FGIR works often follow two steps:discriminative sub-region localization and local feature ***,these works pay less attention on global context *** neglect a fact that the subtle visual difference in challenging scenarios can be highlighted through exploiting the spatial relationship among different subregions from a global view ***,in this paper,we consider both global and local information for FGIR,and propose a collaborative teacher-student strategy to reinforce and unity the two types of *** framework is implemented mainly by convolutional neural network,referred to Teacher-Student Based Attention Convolutional Neural network(T-S-ACNN).For fine-grained local information,we choose the classic Multi-Attention network(MA-Net)as our baseline,and propose a type of boundary constraint to further reduce background noises in the local attention *** this way,the discriminative sub-regions tend to appear in the area occupied by fine-grained objects,leading to more accurate sub-region *** fine-grained global information,we design a graph convolution based Global Attention network(GA-Net),which can combine extracted local attention maps from MA-Net with non-local techniques to explore spatial relationship among *** last,we develop a collaborative teacher-student strategy to adaptively determine the attended roles and optimization modes,so as to enhance the cooperative reinforcement of MA-Net and *** experiments on CUB-200-2011,Stanford Cars and FGVC Aircraft datasets illustrate the promising performance of our framework.

关键词： Fine-grained image recognition Collaborative teacher-student strategy Multi-attention Global attention

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Equivalent Bandwidth Concept and Its Usage in the network Selection

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China communications 2025年第2期22卷 213-225页

作者： Ma Anhua Pan Su Zhou Weiwei Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and TelecommunicationsNanjing 210003China

Maximize the resource utilization efficiency and guarantee the quality of service(QoS)of users by selecting the network are the key issues for heterogeneous network operators,but the resources occupied by users in different networks cannot be compared *** paper proposes a network selection algorithm for heterogeneous ***,the concept of equivalent bandwidth is proposed,through which the actual resources occupied by users with certain QoS requirements in different networks can be compared *** the concept of network applicability is defined to express the abilities of networks to support different *** proposed network selection algorithm first evaluates whether the network has enough equivalent bandwidth required by the user and then prioritizes network with poor applicability to avoid the situation that there are still residual resources in entire network,but advanced services can not be *** simulation results show that the proposed algorithm obtained better performance than the baselines in terms of reducing call blocking probability and improving network resource utilization efficiency.

关键词： call blocking probability equivalent bandwidth heterogeneous network network applicability

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Optimized Qubit -Based Synchronization in Quantum key Distribution

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IEEE communications Letters 2025年第5期29卷 1087-1091页

作者： Sun, Hao-Bing Li, Jian Chu, Xing-Wang Liu, Jing-Yang Ding, Hua-Jian Wang, Qin Nanjing University of Posts and Telecommunications Institute of quantum information and technology Broadband Wireless Communication and Sensor Network Technology Key Lab of Ministry of Education Telecommunication and Networks National Engineering Research Center Nanjing210003 China

Quantum key distribution (QKD) enables the generation of information-theoretic secure keys between two remote parties. A critical component of successful QKD implementation is the effective synchronization of clocks between these users. Traditional methods of locking to a reference clock or transmitting a synchronization signal rely on auxiliary equipment, which increases the complexity and cost, thus hindering the widespread deployment of QKD. Here, we propose a method to achieve clock and pulse synchronization by exploiting a subset of the transmitted qubits. We demonstrate our scheme with a time-bin phase-coding BB84 QKD system and verify the realization of long-term stable key generation over distances of 50 km and 100 km. Our method simplifies the implementation of QKD systems and introduces new possibilities for synchronization algorithms in other quantum communication protocols. © 1997-2012 IEEE.

关键词： Qubits

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Dynamically tunable multiple-polarization-sensitive black phosphorus metasurface detector operating in the mid-infrared region

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Optics Express 2025年第8期33卷 16925-16937页

作者： Kuang, Han Zhuo Wang, Sheng Yi Luo, Hao Zhao, Wen Kui Ge, Hua Wang, Qiu Li, Xiang Jia, Bowen Xu, Ning School of Information Engineering Hubei Key Laboratory of Broadband Wireless Communication and Sensor Networks Wuhan University of Technology Wuhan430070 China Key Laboratory of Artificial Micro- and Nano-Structures Ministry of Education School of Physics and Technology Wuhan University Wuhan430072 China Wuhan430074 China

Polarization-sensitive photodetection plays a critical role in various applications. In this work, we propose a dynamically tunable black phosphorus (BP) photodetector integrated with a Ge2Sb2Te5 (GST225) plasmonic metasurface for mid-infrared polarized light detection. The detector features a chiral gold array within the metasurface, enabling both linear and circular polarization responses. By modulating the crystallization fraction of GST225, the circular dichroism (CD) peak wavelength can be tuned from 3.86 µm to 4.59 µm, while adjusting the gold array geometry further extends the tunable CD peak range from 3.42 µm to 4.71 µm. Within this range, CD and linear dichroism (LD) values exceed 0.4 and 0.42, respectively, under normal incidence. The detector maintains a stable polarization response across varying incident angles. Electrical analysis confirms that the BP layer exhibits distinct photocurrent responses to different polarization states, including left-handed circularly polarized (LCP), right-handed circularly polarized (RCP), and linearly polarized light along the x- (Lx) and y-axes (Ly). With its tunable polarization selectivity and robust performance, the proposed metasurface photodetector is highly promising for mid-infrared applications in sensing, imaging, and quantum computing and communication. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Dichroism

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Multi-Modal Sensing and Lighting Estimation for PoE-Enabled Intelligent and Energy-Efficient Lighting networks

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IEEE Internet of Things Journal 2025年

作者： Tang, Liwei Xu, Yuanyuan Liu, Xiaodong Wang, Yuhao Wang, Jinyuan Shao, Huilong Nanchang University School of Information Engineering Nanchang330031 China Nanchang Laboratory Nanchang330224 China Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing210003 China

The application of power over Ethernet (PoE)-enabled lighting has emerged as a groundbreaking technology with the potential to achieve cooperative control and create an energy-saving lighting network. However, fine-grained user-side lighting environment perception is crucial to improve energy efficiency and user experience. To tackle this issue, a PoE-enabled intelligent lighting network with multi-modal sensing is proposed. Specifically, a multi-modal sensor is designed and installed on the side of the luminaire to provide both fine-grained lighting environment monitor and dimming. Then, a multilayer perceptron (MLP)-based estimation scheme is proposed to estimate the illumination and color temperature information around the user activity area. Moreover, an experimental lighting network is constructed and deployed in a classroom to measure practical lighting dataset. The proposed scheme effectively estimates the lighting quality on the user side based on the measurement data. Furthermore, based on the estimated information and the collaborative control capabilities of PoE, the operating current of the luminaire is updated in real time, and thus the ambient light resource is fully utilized. Finally, the proposed lighting network achieves a 39.99% energy saving. © 2014 IEEE.

关键词： Lighting fixtures

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Physical Layer Security for Friendly Jammers Assisted Satellite-Terrestrial Integrated networks

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IEEE Internet of Things Journal 2025年

作者： Cao, Weifeng Zou, Yulong Li, Bin Zhu, Jia Nanjing Institute of Technology School of Automation Nanjing211167 China NUPT School of Telecommunications and Information Engineering Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology China

This paper investigates the physical layer security (PLS) of a satellite-terrestrial integrated network (STIN) consisting of a satellite (S), a destination (D), and several friendly jammers in the presence of an eavesdropper (E). For improving PLS of the STIN, we propose three friendly jammer assisted communication schemes to help S securely send confidential information to D, i.e., the random jammer selection assisted communication (RJSC) scheme, the optimal jammer selection assisted communication (OJSC) scheme, and the multiple jammers assisted communication (MJC) scheme. For performance comparison, the non-jammer assisted communication (NJC) scheme is also presented. We analyze secrecy performance of the NJC, RJSC, OJSC, and MJC schemes by carrying out their closed-form secrecy outage probability (SOP) expressions, respectively. Numerical results unveil that the RJSC, OJSC, and MJC schemes exceed the NJC scheme with regard to their SOPs (e.g., as shown in Fig. 2, when the signal-to-noise ratio is 25 dB, SOP of the STIN drops from 70% to 3%), and the OJSC scheme can get the best secrecy performance, showing the secrecy benefits of adopting friendly jammers assisted communication schemes against eavesdropping. Additionally, by increasing the number of friendly jammers, the secrecy performance of the OJSC and MJC schemes can be significantly enhanced, while that of the RJSC scheme remains unchanged. © 2014 IEEE.

关键词： Jamming

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Efficient security analysis for quantum key distribution against side-channel leakage

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Optics Express 2025年第10期33卷 20588-20597页

作者： Luo-Jia Ma Yue-ying Wang Ming-Shuo Sun Chun-Hui Zhang Hua-Jian Ding Xing-Yu Zhou Qin Wang Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China Broadband Wireless Communication and Sensor Network Technology Key Lab of Ministry of Education NUPT Nanjing 210003 China chz@*** qinw@***

Quantum key distribution (QKD) allows the transmission of keys with unconditional security. Nevertheless, a discrepancy remains between the theoretical framework and the practical implementation, as device imperfections are frequently neglected in most QKD protocols. Some previous works proposed to use Hong-Ou-Mandel interference to quantify information leakage from side-channels. However, the security bound was relatively loose, resulting in poor performance. In this paper, we present an improved method for the security analysis of practical QKD protocols and provide a more precise parameter estimation. Furthermore, we apply it to several important QKD protocols, including BB84, measurement-device-independent, and twin-field, and carry out corresponding numerical simulations. Our work demonstrates significant improvements in both the key rate and the transmission distance compared to previous methods, representing a crucial step towards the practical implementation of QKD.

关键词： Bit error rate Diode lasers Interference Numerical simulation Quantum key distribution Quantum key distribution networks

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