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arXiv 2019年

作者： Li, Wei Zhao, Shengmei Nanjing University of Posts and Telecommunications Institute of Signal Processing and Transmission Nanjing210003 China Nanjing University of Posts and Telecommunications Key Lab Broadband Wireless Communication and Sensor Network Ministy of Education Nanjing210003 China National Laboratory of Solid State Microstructures Nanjing University Nanjing210093 China

Evaluating the theoretical limit of the amount of information Eve can steal from a quantum key distribution protocol under given conditions is one of the most important things that need to be done in security proof. In addition to source loopholes and detection loopholes, channel attacks are considered to be the main ways of information leakage, while collective attacks are considered to be the most powerful active channel attacks. Here we deduce in detail the capability limit of Eve’s collective attack, the most powerful attack scheme in channel attacks, in non-entangled quantum key distribution, like BB84 and measurement-device-independent protocols, and entangled quantum key distribution, like device-independent protocol, in which collective attack is composed of quantum weak measurement and quantum unambiguous state discrimination detection. The theoretical results show that collective attacks are equivalent in entangled and non-entangled quantum key distribution protocols. We also find that compared with the loose bond on Eve’s attack provided by security proof based on entanglement purification, the security proof against collective attacks not only improves the system’s tolerable bit error rate, but also improves the key rate. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum cryptography

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Wave-particle duality in single-photon entanglement

arXiv

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arXiv 2019年

The simplest single-photon entanglement is the entanglement of the vacuum state and the single-photon state between two path modes. The verification of the existence of single-photon entanglement has attracted extensive research interests. Here, based on the construction of Bell’s inequality in wave space, we propose a new method to verify single photon entanglement. Meanwhile, we define the wave state in two-dimensional space relative to the photon number state, and propose a method to measure it. Strong violation of Bell inequality based on joint measurement of wave states indicates the existence of single photon entanglement with certainty. Wave state entanglement obtained from Fourier transform of single photon entanglement and the corresponding measurement protocols will provide us with more information-carrying schemes in the field of quantum information. The difference in the representation in photon-number space and wave space implies the wave-particle duality of single photon entanglement. Copyright © 2019, The Authors. All rights reserved.

关键词： Particle beams

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Phase matching quantum key distribution based on single-photon entanglement

arXiv

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arXiv 2019年

作者： Li, Wei Wang, Le Zhao, Shengmei Nanjing University of Posts and Telecommunications Institute of Signal Processing and Transmission Nanjing210003 China Nanjing University of Posts and Telecommunications Key Lab Broadband Wireless Communication and Sensor Network Ministy of Education Nanjing210003 China National Laboratory of Solid State Microstructures Nanjing University Nanjing210093 China

Two time-reversal quantum key distribution (QKD) schemes are the quantum entanglement based device-independent (DI)-QKD and measurement-device-independent (MDI)-QKD. The recently proposed twin field (TF)-QKD, also known as phase-matching (PM)-QKD, has improved the key rate bound from O(η) to O(√η) with η the channel transmittance. In fact, TF-QKD is a kind of MDIQKD but based on single-photon detection. In this paper, we propose a different PM-QKD based on single-photon entanglement, referred to as SEPM-QKD, which can be viewed as a time-reversed version of the TF-QKD. Detection loopholes of the standard Bell test, which often occur in DI-QKD over long communication distances, are not present in this protocol because the measurement settings and key information are the same quantity which is encoded in the local weak coherent state. We give a security proof of SEPM-QKD and demonstrate in theory that it is secure against all collective attacks and beam-splitting attacks. The simulation results show that the key rate enjoys a bound of O (√η) with respect to the transmittance. SEPM-QKD not only helps us understand TF-QKD more deeply, but also hints at a feasible approach to eliminate detection loopholes in DI-QKD for long-distance communications. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum cryptography

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Author Correction: An Effective Way for Simulating Oceanic Turbulence Channel on the Beam Carrying Orbital Angular Momentum

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Scientific reports 2020年第1期10卷 1268页

作者： Sunxiang Pan Le Wang Wennai Wang Shengmei Zhao Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications(NUPT) Nanjing 210003 China. Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China. wangwn@***. Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications(NUPT) Nanjing 210003 China. zhaosm@***. Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China. zhaosm@***.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

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Design and Analysis of Cooperative Multicast-Unicast Transmission Scheme in Hybrid Satellite-Terrestrial networks

Design and Analysis of Cooperative Multicast-Unicast Transmi...

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International Conference on communication Systems

作者： Liangjingrong Liu Jiaxin Zhang Xing Zhang Peng Wang Yuanjun Wang Le Ouyang Wireless Signal Processing & Networks Lab (WSPN) Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781538678657;9781538678640

The rapid development of the mobile Internet results in the explosive increase of content demands. In order to improve the efficiency of content delivery, the mobile edge computing (MEC) has been widely explored. Meanwhile, as the hybrid satellite-terrestrial network gradually becomes the trend of next-generation mobile communication, the terrestrial backhaul load is expected to be relieved. However, existing works do not take into account the exploitable potential of a benign combination of the user preference characteristics and evolving satellite processing capabilities, thus we proposed hybrid satellite-terrestrial double-edge networks (HSTDEN), promoting the collaboration between satellite MEC (S-MEC) and the terrestrial MEC (T-MEC). Besides, a novel cooperative multicast-unicast transmission (CMUT) scheme is proposed. Multicast can efficiently serve popular requests, while unicast is targeted at personalized requests to avoid them being never served. Finally, a system-level OPNET platform is built to analyze the performance of proposed scheme. Numerical results show that our proposed CMUT scheme has advantages in relieving terrestrial backhaul load, especially in the scenarios where content convergence is high.

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Optical encryption scheme based on ghost imaging with disordered speckles

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Chinese Physics B 2017年第5期26卷 160-164页

作者：张玉东赵生妹 Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

An optical encryption scheme based on a ghost imaging system with disordered speckles is proposed to obtain a higher security with a small key. In the scheme, Alice produces the random speckle patterns and obtains the detection results with the help of a computational ghost imaging（CGI） system. Then Alice permutes the order of the random speckle patterns and shares the permutation sequence as a secure key to the authorized users. With the secure key, Bob could recover the object with the principle of the CGI system, whereas, the unauthorized users could not obtain any information of the object. The numerical simulations and experimental results show that the proposed scheme is feasible with a small key, simultaneously,it has a higher security. When the eavesdropping ratio（ER） is less than 40%, the eavesdropper cannot acquire any useful information. Meanwhile, the authorized users could recover completely with the secure key.

关键词： ghost encryption secure speckle recover authorized disordered users reconstructed PSNR

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Comparative channel study of ray tracing and measurement for an indoor scenario at 28 GHz 12

Comparative channel study of ray tracing and measurement for...

引用

12th European Conference on Antennas and Propagation, EuCAP 2018

作者： Zhan, Jinnan Zhang, Jianhua Tian, Lei Zhang, Xinzhuang Tang, Pan Dou, Jianwu Wei, Hewen Key Lab of Universal Wireless Communications Ministry of Education New Zealand State Key Lab of Networking and Switching Technology Beijing University of Posts and Telecommunications Mailbox NO.92 Beijing100876 China Wireless Algorithm Department Product R and D system ZTE Corp. Ltd. Shanghai201210 China National Key Laboratory of Science and Technology on Blind Signal Processing Chengdu Sichuan610041 China

ISBN: (纸本)9781785617911

The millimeter wave communication is important for future wireless systems. In this paper, the channel characteristics at 28 GHz in an indoor scenario are researched based on ray tracing (RT) simulation and measurement. In the RT simulation, various configurations, such as different number of reflections, diffractions and penetrations are used. As for the measurement, two setups are implemented in order to analyze more parameters. Setup one is that biconical antennas are used at both the transmitter (TX) and receiver (RX). The other setup is that horn antenna at RX is rotated 360◦ in azimuth with a step of 5◦ when an omni-directional antenna located at TX. Meanwhile, antenna is rotated one circle with an elevation angle of 10◦, 0◦ and -10◦, respectively. Path loss and K-factor are analyzed firstly, and analysis results indicate the RT result with 1 or 2 reflections, 1 diffractions and 5 penetrations in this conference room is closest to the measurement result and channel models in 3GPP TR 38.901. Then, the root mean square (RMS) delay spread and RMS angular spread are investigated, which shows the value of measurement is a bit larger than RT because of the limitation of azimuth and elevation step. According to all the results, 1-2 reflections, 1 diffraction and 5 penetrations can be used in RT for future analysis of indoor scenario at 28 GHz. © Institution of Engineering and *** Rights Reserved.

关键词： Ray tracing

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Modulating the Lasing Performance of the Quantum Dot-Cavity System by Adding a Resonant Driving Field

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Chinese Physics Letters 2017年第1期34卷 115-119页

作者：秦利国王琴 Institute of Signal Processing and Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003 Key Lab of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education) Nanjing University of Posts and TelecommunicationsNanjing 210003

We propose a new scheme on modulating the lasing performance of a quantum dot-cavity system. Compared to the conventional above-band pump, in our new scheme an additional resonant driving field is applied on the quantum dot-cavity system. By employing the master equation theory and the Jaynes-Cummings model, we are able to study the interesting phenomenon of the coupling system. To compare the different behaviors between using our new scheme and the conventional method,we carry out investigatioin for both the 'good system'and 'more realistic system', characterizing several important parameters, such as the cavity population, exciton population and the second-order correlation function at zero time delay. Through numerical simulations,we demonstrate that for both the good system and more realistic system, their lasing regimes can be displaced into other regimes in the presence of a resonant driving field.

关键词： Modulating the Lasing Performance of the Quantum Dot-Cavity System by Adding a Resonant Driving Field

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An Enhanced LMMSE Channel Estimation under High Speed Railway Scenarios

An Enhanced LMMSE Channel Estimation under High Speed Railwa...

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IEEE International Conference on communications Workshops

作者： Qing Tang Hang Long Haojun Yang Yuli Li Wireless Signal Processing and Network (WSPN) Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications (BUPT) 100876 China

ISBN: (纸本)9781509015269

With the rapid deployment of the high speed railway (HSR), the wireless communication in HSR has been one of the indispensable scenarios in the fifth generation (5G) communications. In order to improve the performance of the orthogonal frequency division multiplexing (OFDM) system in the HSR scenarios, we propose an enhanced linear minimum mean square error channel estimation scheme based on multi-path Doppler frequency offset (DFO) estimation in this paper. The proposed scheme can estimate DFO of each path, and generate the frequency and time channel correlation more accurately, which can improve the accuracy of channel estimation in the HSR scenarios. Simulation results show that the proposed scheme can reduce the channel estimation error and achieve attractive gain in the HSR scenarios.

关键词： Channel estimation OFDM Estimation Correlation 5G mobile communication Frequency-domain analysis wireless communication

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Efficient separating orbital angular momentum mode with radial varying phase

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Photonics Research 2017年第4期5卷 267-270页

作者： CHENG LI SHENGMEI ZHAO Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education

It is shown that orbital angular momentum(OAM) is a promising new resource in future classical and quantum communications. However, the separation of OAM modes is still a big challenge. In this paper, we propose a simple and efficient separation method with a radial varying phase. In the method, specific radial varying phases are designed and modulated for different OAM modes. The resultant beam is focused to the spots with different horizontal and vertical positions after a convex lens, when the coordinate transformation, including two optical elements with coordinate transformation phase and correct phase, operates on the received *** horizontal position of the spot is determined by the vortex phases, and the vertical position of the spot is dependent on the radial varying phases. The simulation and experimental results show that the proposed method is feasible both for separation of two OAM modes and separation of three OAM modes. The proposed separation method is available in principle for any neighboring OAM modes because the radial varying phase is controlled. Additionally, no extra instruments are introduced, and there is no diffraction and narrowing process limitation for the separation.

关键词： OAM Efficient separating orbital angular momentum mode with radial varying phase mode

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