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Experimental demonstration of five-intensity measurement-device-independent quantum key distribution over 442 km

Physical Review A 2023年第2期108卷 022605-022605页

作者： Jing-Yang Liu Xiao Ma Hua-Jian Ding Chun-Hui Zhang Xing-Yu Zhou Qin Wang Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China and Telecommunication and Networks National Engineering Research Center Nanjing University of Posts and Telecommunications Nanjing 210003 China

Decoy-state measurement-device-independent quantum key distributions (MDI-QKD) can remove all the loopholes of detection devices and establish secure keys using weak coherent sources. To further extend the secure distance and enhance the key rate, Chau proposed a novel framework for decoy-state MDI-QKD that supports an arbitrary number of intensities and investigated its performance in detail [H. F. Chau, Phys. Rev. A 102, 012611 (2020)]. Here, we experimentally demonstrate its one kind, i.e., the five-intensity MDI-QKD protocol, and achieve a positive key rate over 442 km of ultralow-loss optical fibers. Our results verify that the five-intensity protocol outperforms four-intensity protocols in terms of both distance and key rate, setting a record distance for typical MDI-QKD.

关键词： Quantum cryptography

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A grouping dynamic framed slotted ALOHA collision tracking algorithm

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Journal of Computational Information Systems 2014年第9期10卷 3989-3996页

作者： Zhang, Xuejun Ye, Chuanling Tian, Feng Sun, Zhixin Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Edu. Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Electronic Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China

This paper proposed an improved grouping tag anti-collision algorithm based on the dynamic framed slotted ALOHA algorithm and collision tracking tree algorithm. The analysis of performance and the result of simulation show that this algorithm though combining the ALOHA-based algorithm, tree-based algorithm and grouping theory, improve the throughput of the system efficiency and reduce the total query the number of slots. © 2014 Binary Information Press.

关键词： Radio frequency identification (RFID)

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Complete analysis of the maximally hyperentangled state via the weak cross-Kerr nonlinearity

arXiv

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arXiv 2022年

作者： Zeng, Zhi Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China

We present a simple method for the complete analysis of maximally hyperentangled state in polarization and spatial-mode degrees of freedom assisted by the weak cross-Kerr nonlinearity. Our method not only can be used for two-photon hyperentangled Bell state analysis and three-photon hyperentangled Greenberger-Horne-Zeilinger (GHZ) state analysis, but also is suitable for N-photon hyperentangled GHZ state analysis. In our protocols, the bit information of hyperentanglement is read out via the nonlinear interaction, and the phase information is obtained by using linear optical element and single photon detector. This approach is achievable with the current technology, and will be useful for the practical high-capacity quantum communication schemes. © 2022, CC BY.

关键词： Photons

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Anchored Neighborhoods Search Based on Global Dictionary Atoms for Face Photo-Sketch Synthesis

Anchored Neighborhoods Search Based on Global Dictionary Ato...

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2019第十一届数字图像处理国际会议

作者： Feng Liu Ran Xu Jieying Zheng Qiuli Lin Zongliang Gan College of Educational Science and Technology Nanjing University of Posts and Telecommunications Jiangsu Province Key Lab on Image Processing & Image Communications Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications

Example-based face sketch synthesis technology generally requires face photo-sketch images with face alignment and size *** break through the limitation,we propose a global face sketch synthesis method:In training,all training photo-sketch patch pairs are collected together and a photo feature dictionary is learned from the photo *** each atom of the dictionary,its K closest photo-sketch patch pairs are clustered,namely "Anchored Neighborhood".In testing,for each test photo patch,we search its nearest photo patch in the Anchored Neighborhood determined by its closest atom,then the corresponding sketch patch is the *** the same way,we train and test in the high-frequency domain and synthesis the high-frequency ***,the fusion of the initial and the high-frequency results is the final *** experiments on three public face sketch datasets and various real-world photos demonstrate the effectiveness and robustness of the proposed method.

关键词： Face sketch synthesis Dictionary learning Dictionary atom Anchored neighborhood Image patch

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Reference-frame-independent measurement-device-independent quantum key distribution using fewer states

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Physical Review A 2021年第2期103卷 022602-022602页

作者： Jing-Yang Liu 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 Laboratory of Ministry of Education Ministry of Education Nanjing 210003 China Telecommunication and Networks National Engineering Research Center NUPT Nanjing 210003 China

Reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) is immune to both detector side channel attacks and slow drifts of reference frames, and thus possesses a high level of security. In the traditional protocol of RFI-MDI-QKD, each legitimate user, Alice or Bob, has to prepare six encoding states in three orthogonal bases (X, Y, and Z), which are sent to the untrusted third party, Charlie. Then all the successful counting events are utilized for parameter estimations, which suffer from a severe finite-size effect. In this paper, we propose a scheme on RFI-MDI-QKD with fewer states and demonstrate that it can be secured and made useful by utilizing semidefinite programming. Numerical simulation results reveal the equivalence between those groups of different monitoring states from Alice and Bob. In addition, when considering practical experimental conditions and taking finite-size effects into account, our proposal can achieve a better performance than the traditional six-state RFI-MDI scheme, which provides a resource-saving and simpler state-preparation approach for practical implementations without sacrificing key rates.

关键词： Quantum communication Quantum cryptography

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Arbitrary-Oriented Ship Detection Based on Feature Filter and KL Loss

Arbitrary-Oriented Ship Detection Based on Feature Filter an...

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Chen Li Lei Wang Bin Kang Mingkai Chen Jingwu Cui Baoyu Zheng Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education China National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology Nanjing University of Posts and Telecommunications China

ISBN: (数字)9781728172361

ISBN: (纸本)9781728172378

Although deep learning has been dominant in the field of target detection, there are still some challenges in the field of detection of ships: horizontal boundary box contains too much redundancy and noise in the scene of large scale and dense arrangement of ships, and there are many interferences in remote sensing optical images that affect the bounding box regression. Recent neural network for ship detection is generally used to extract the pixel information in the image to achieve rapid positioning and boundary box regression, or to process the dataset, so as to train a more robust network. However, these methods do not focus on the original feature map and loss functions of the target, which directly lead to the effects of ship positioning and regression. In this paper, we propose a ship detection network based on feature filter and Kullback-Leibler (KL) divergence loss function. In this paper, we propose to use mask filters on the output of the region of interest (ROI) network to remove the noise around the rotating bounding box, which is conducive to the regression of the rotating bounding box and angle in the second stage. In order to get a better bounding box, we propose to use KL loss function for regression of bounding box parameters. With the optimization of KL loss, the bounding box can better surround the ship. We carried out experiments on our own remote sensing ship image dataset for ship detection, it contains 5,126 remote sensing satellite images and more than 23800 ships in 6 categories. The dataset contains a variety of scenarios and challenges. Experiments show that the method is accurate and effective, and the bounding box has good wrapping property.

关键词： Marine vehicles Feature extraction Remote sensing Object detection Redundancy Interference Proposals

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Source monitoring twin-field quantum key distribution assisted with Hong-Ou-Mandel interference

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Physical Review Research 2023年第4期5卷 043179-043179页

作者： Ming-shuo Sun Wen-Lin Wang Xing-Yu Zhou Chun-Hui Zhang 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 Telecommunication and Networks National Engineering Research Center NUPT Nanjing 210003 China

Twin-field quantum key distribution (TF-QKD) can change the channel-loss dependence of key rates from O(η) to O(η) and thus significantly increase the secure key rate compared with other existing quantum key distribution protocols. However, it does not take the source security into account in most present TF-QKD protocols. Here, we propose to employ the Hong-Ou-Mandel interference to characterize the source security, i.e., to use the interference visibility to quantify the information leakage from detectable side channels of sources. Furthermore, we establish a corresponding theoretical model and calculate the final key rate, by using the three-intensity decoy-state method and taking finite-data-size effects into account. Consequently, by employing our present scheme, the secure transmission distance can be longer than 100 km under current experimental conditions, significantly surpassing present device-independent QKD systems.

关键词： Quantum communication Quantum cryptography Quantum protocols

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Security-Reliability Tradeoff Analysis of Spectrum-Sharing Aided Satellite-Terrestrial networks

Security-Reliability Tradeoff Analysis of Spectrum-Sharing A...

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IEEE Globecom Workshops

作者： Xiaojin Ding Gengxin Zhang Dexin Qu Tiecheng Song Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

In this paper, we investigate the physical-layer security of a spectrum-sharing aided satellite-terrestrial integrated network comprised of a pair of satellite system and terrestrial system, which can utilize the shared spectrum in the presence of an eavesdropper. We propose a specifically designed satellite scheduling scheme to guarantee wireless transmission of the satellite system against eavesdropping attacks in the face of co-channel interference generated by the terrestrial communication system, where the specifically designed satellite scheduling scheme is represented by multi-satellite scheduling (MSS). We analyze the security-reliability tradeoff (SRT) of the MSS scheme, where the security and the reliability are characterized by the intercept probability and the outage probability, respectively. For comparison purposes, we also provide the SRT analysis of the round-robin satellite scheduling (RSS) scheme. In addition, numerical SRT results demonstrate that the proposed MSS scheme significantly outperform the RSS scheme in terms of their SRT.

关键词： Satellite broadcasting Silicon Satellites Security wireless communication Interference Scheduling

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A Review of the Evolutionary Algorithm Based VRP Problem 42

A Review of the Evolutionary Algorithm Based VRP Problem

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42nd Chinese Control Conference, CCC 2023

作者： Pan, Lili Hu, Bing Sun, Zhe Xu, Lei Gong, Guangfu Xie, Xiangpeng Sun, Zhixin Post Industry Technology Research and Development Center of the State Posts Bureau Nanjing University of Posts and Telecommunications Nanjing210023 China Nanjing University of Posts and Telecommunications Post Big Data Technology and Application Engineering Research Center of Jiangsu Province Nanjing210023 China Ministry of Education Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing210023 China Anhui Yougu Express Intelligent Technology Co. LTD Anhui Nanling241300 China

ISBN: (纸本)9789887581543

The problem of vehicle routing planning (VRP) has far-reaching influence, and is widely used in vehicle scheduling, industrial production, transportation, logistics and distribution. The study of VRP and its associated derivations has grown significantly in recent years. So, starting with the fundamental VRP, this paper categorizes the VRP based on its traits and real-world applications. It then in-depth analyses the capacity constrained VRP, time window VRP, batched delivery VRP, dynamic VRP, and stochastic demand VRP, and provides an update on each type of VRP's research. Additionally, a summary of the VRP problem-solving methods is provided. The study of evolutionary algorithms is the main topic of this paper, and the fundamental solution method is provided in accordance with the development of the algorithms. © 2023 Technical Committee on Control Theory, Chinese Association of Automation.

关键词： Vehicle routing

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Proposal for the complete high-dimensional Greenberger-Horne-Zeilinger state measurement

arXiv

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arXiv 2022年

A theoretical proposal for the complete analysis of high-dimensional Greenberger-Horne-Zeilinger (GHZ) state is presented in this Letter. We first demonstrate the approach for the complete three-photon GHZ state measurement in three dimensions, and then generalize it to the situation of N-photon system in d dimensions. In our approach, the photonic hyperentanglement and quantum Fourier transform are both utilized. The presented proposal will be useful for the high-dimensional multi-photon quantum computation and quantum communication. © 2022, CC BY.

关键词： Quantum communication

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