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Security bound of continuous-variable measurement-device-independent quantum key distribution with imperfect phase reference calibration

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arXiv 2019年

作者： Ma, Hong-Xin Huang, Peng Wang, Tao Bai, Dong-Yun Wang, Shi-Yu Bao, Wan-Su Zeng, Gui-Hua Henan Key Laboratory of Quantum Information and Cryptography Zhengzhou Information Science and Technology Institute Zhengzhou Henan450001 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China State Key Laboratory of Advanced Optical Communication Systems Networks and Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai200240 China

Phase reference calibration is a necessary procedure in practical continuous-variable measurement-deviceindependent quantum key distribution (CV-MDI-QKD) for the need of Bell-State Measurement (BSM). However, the phase reference calibration may become imperfect in practical applications. We explored the practical security of CV-MDI-QKD with imperfect phase reference calibration under realistic conditions of lossy and noisy quantum channel. Specifically, a comprehensive framework is developed to model and characterize the imperfection of practical phase reference calibration operation, which is mainly caused by the non-synchronization of two remote lasers in senders. Security analysis shows that the imperfect phase reference calibration has significant side effects on the performance and security of the CV-MDI-QKD protocol. A tight security bound to excess noise introduced by imperfect phase reference calibration is derived for reverse reconciliation against arbitrary collective attacks in the asymptotic limit, and the tolerance of the CV-MDI-QKD protocol to this excess noise is also obtained. This security analysis framework can eliminate the security hazards caused by imperfect phase reference calibration without changing the existing CV-MDI-QKD system structure. Copyright © 2019, The Authors. All rights reserved.

关键词： Calibration

Pattern-Dependent Equalization for PAM-4 IM/DD System with Severe Bandwidth Limitation

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Pattern-Dependent Equalization for PAM-4 IM/DD System with S...

Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Wei Wang Dongdong Zou Weihao Ni Zhaohui Li Fan Li Yi Cai Qi Sui School of Electronics and Information Technology Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University Guangzhou China Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Suzhou Key Laboratory of Advanced Optical Communication Network Technology Soochow University Suzhou China Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Technology Zhuhai China

LUT enabled pattern-dependent equalization combined with MLSE is proposed for bandwidth-limited IM/DD system. The experimental results show that the proposed method can provide significant improvement compared to the ... 详细信息

关键词： Maximum likelihood estimation Sensitivity C-band Asia Bandwidth Receivers Table lookup

Tracking Performance of Networked systems with Limited Bandwidth and Colored Noise

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Tracking Performance of Networked Systems with Limited Bandw...

2022 Chinese Automation Congress, CAC 2022

作者： Zhang, Bin Jiang, Xiaowei Sun, Li Zhang, Xianhe School of Automation China University of Geosciences Wuhan430074 China Key Laboratory of System Control and Information Processing Ministry of Education Shanghai200240 China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074 China Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Wuhan430074 China School of Statistics and Mathematics Zhongnan University of Economics and Law Wuhan430074 China School of Electrical Engineering and Automation Hubei Normal University Huangshi435002 China

ISBN: (纸本)9781665465335

This study investigated the optimal tracking performance (OTP) of multi-input multi-output (MIMO), discrete- time networked control systems (NCSs). The limits of tracking performance (TP) under the influences of bandwidth, encoding- decoding, and additive coloured Gaussian noise (ACGN) are derived using the techniques of coprime decomposition and all-pass decomposition. The results reveal the negative impact of non-minimum phase (NMP) zeros and unstable poles of the plant as well as network communication constraints on the TP of NCSs. Finally, a numerical simulation is discussed and verifies our conclusions. © 2022 IEEE.

关键词： Networked control systems

Continuous-variable measurement-device-independent quantum key distribution with photon subtraction

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arXiv 2017年

作者： Ma, Hong-Xin Huang, Peng Bai, Dong-Yun Wang, Shi-Yu Bao, Wan-Su Zeng, Gui-Hua Zhengzhou Information Science and Technology Institute Zhengzhou450004 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory on Navigation and Location-based Service Center of Quantum Information Sensing Processing Shanghai Jiao Tong University Shanghai200240 China

It has been found that non-Gaussian operations can be applied to increase and distill entanglement between Gaussian entangled states. We show the successful use of the non-Gaussian operation, in particular, photon subtraction operation, on the continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol. The proposed method can be implemented based on existing technologies. Security analysis shows that the photon subtraction operation can remarkably increase the maximal transmission distance of the CV-MDI-QKD protocol, which precisely make up for the shortcoming of the original CV-MDI-QKD protocol, and 1-photon subtraction operation has the best performance. Moreover, the proposed protocol provides a feasible method for the experimental implementation of the CV-MDI-QKD protocol. Copyright © 2017, The Authors. All rights reserved.

关键词： Gaussian noise (electronic)

Shear-Thickening Effect in Electrorheological Fluid-Assisted Polishing

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SSRN

SSRN 2024年

作者： Zhou, Zilong Zhou, Rixin Zhu, Tieyu Zhu, Lijun Dong, Xiaoxing Provincial Key Laboratory of Multimodal Perceiving and Intelligent Systems Jiaxing University Jiaxing314001 China College of Information Science and Engineering Jiaxing University Jiaxing314001 China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education and Zhejiang Province Zhejiang University of Technology Hangzhou310023 China

The low processing efficiency of electrorheological fluid-assisted polishing (EFP) often leads to poor surface finishes, which deteriorate further over time. This study reports a novel approach using the shear-thickening effect in slurry to enhance EFP efficiency. Increasing the cassava starch content in the slurry from 45 % to 55 % boosted the material removal rate by 59.8 %. This method not only improves efficiency but also utilizes an eco-friendly slurry, reducing the surface roughness of Al2O3 ceramic workpieces from Ra 76.3 nm to Ra 16.0 nm. Thus, the shear-thickening effect in EFP offers a straightforward and equipment-free way to achieve high-quality surfaces. © 2024, The Authors. All rights reserved.

关键词： Efficiency

Security analysis of practical continuous-variable quantum key distribution systems under laser seeding attack

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arXiv 2019年

作者： Zheng, Yi Huang, Peng Huang, Anqi Peng, Jinye Zeng, Guihua College of Information Science and Technology Northwest University Xi’anShaanxi710127 China State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai200240 China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha410073 China Greatwall Quantum Laboratory China Greatwall Technology Changsha410205 China

Here, we investigate the security of the practical one-way CVQKD and CV-MDI-QKD systems under laser seeding attack. In particular, Eve can inject a suitable light into the laser diodes of the light source modules in the two kinds of practical CVQKD systems, which results in the increased intensity of the generated optical signal. The parameter estimation under the attack shows that the secret key rates of these two schemes may be overestimated, which opens a security loophole for Eve to successfully perform an intercept-resend attack on these systems. To close this loophole, we propose a real-time monitoring scheme to precisely evaluate the secret key rates of these schemes. The analysis results indicate the implementation of the proposed monitoring scheme can effectively resist this potential attack. Copyright © 2019, The Authors. All rights reserved.

关键词： Light sources

Practical security of continuous-variable quantum key distribution with reduced optical attenuation

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arXiv 2019年

In a practical CVQKD system, the optical attenuator can adjust the Gaussian-modulated coherent states and the local oscillator signal to an optimal value for guaranteeing the security of the system and optimizing the performance of the system. However, the performance of the optical attenuator may deteriorate due to the intentional and unintentional damage of the device. In this paper, we investigate the practical security of a CVQKD system with reduced optical attenuation. We find that the secret key rate of the system may be overestimated based on the investigation of parameter estimation under the effects of reduced optical attenuation. This opens a security loophole for Eve to successfully perform an intercept-resend attack in a practical CVQKD system. To close this loophole, we add an optical fuse at Alice’s output port and design a scheme to monitor the level of optical attenuation in real time, which can make the secret key rate of the system evaluated precisely. The analysis shows that these countermeasures can effectively resist this potential attack. Copyright © 2019, The Authors. All rights reserved.

关键词： Electromagnetic wave attenuation

Ghost Aperture Synthesis Imaging with Computational Aberration Cancellation

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arXiv 2022年

作者： Sun, Shuai Nie, Zhen-Wu Li, Yue-Gang Lin, Hui-Zu Liu, Wei-Tao Chen, Ping-Xing Institute for Quantum Science and Technology College of Science National University of Defense Technology Hunan Changsha410073 China Interdisciplinary Center of Quantum Information College of Science National University of Defense Technology Hunan Changsha410073 China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Hunan Changsha410073 China State Key Laboratory of Advanced Optical Communication Systems and Networks Institute for Quantum Sensing and Information Processing School of Sensing Science and Engineering Shanghai Jiao Tong University Shanghai200240 China

Although optical aperture synthesis has been generally regarded as the only access to very large imager for over a century, the problem of phasing all the giant sub-apertures on the scale of wavelength is still prohibitive. Besides, the accompanied adaptive optics combatting the atmospheric turbulence is also bulky and complicated. We here propose a new paradigm aperture synthesis imager through turbulence, based on computational ghost imaging method. The complex aberrations on the signal path are computationally cancelled by introducing an optimum compensation phase on the reference path. With the advanced aberration cancellation, our imager is free from phasing and aberrations problem. The image degradation due to turbulence is also suppressed and even eliminated without any guide star or wavefront shaping device. Experimentally, diffraction-limited imaging is achieved under turbulence featuring transverse coherence length far less than the optical aperture of the system. Copyright © 2022, The Authors. All rights reserved.

关键词： Atmospheric turbulence

FAULT-TOLERANT ASSOCIATE MEMORIES

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systems AND COMPUTERS IN JAPAN 1995年第7期26卷 1-12页

作者： FUJIWARA, E TANAKA, T Member Faculty of Engineering Tokyo Institute of Technology Tokyo Japan 152 Eui Fujiwara:received his B.S. and M.S. degrees in Electronics Engineering in 1968 and 1970 respectively and his Dr. of Eng. degree in 1981 all from Tokyo Institute of Technology. In 1970 he joined the NTT Musashino Electrical Communication Laboratories and engaged in developing PIPS-1 and PIPS-11 computer systems. In 1988 he joined the Department of Computer Science Tokyo Institute of Technology as an Associate Professor. In 1990 he became a full Professor. He was a Visiting Professor at the Center for Advanced Computer Studies the University of Southwestern Louisiana from June 1985 to July 1986. His current research interests include coding theory for computers fault-tolerant memories VLSI defect-toleranceand WSI systems. He is a co-author ofError Control Coding for Computer Systems(Prentice-Hall1989) EssentiaLF of Error-Correcting Coding Techniques (Academic Press 1990) and other books. Dr. Fujiwara received the Young Engineer Award from the I.E.I.C.E. in 1978 and the Teshima Memorial Research Award in 1991. He is a senior member of the IEEE and a member of the Information Processing Society Japan. Associate Member

Because of its capability of high-speed search, the associative memory (CAM) is expected to be used in a variety of information processing systems. In this paper, novel fault-tolerant techniques which are effective for on-line use are proposed for TLB which is an example of the application of CAM. First, fault and error models of the TLB consisting of the CAM part and the SRAM part are clarified. Then, the fault-tolerant techniques for these faults and errors, such as distance separable technique, cod-ing technique, simplified 1-out-of-n check and graceful degradation, are proposed. The distance separable technique which encodes the data stored in the CAM part is the one which masks the faulty CAM part and prevents errors from propagating to the subsequent circuits. The coding technique checks the one-to-one correspondence between the data in the CAM and those in SRAM by using the SEC-DED code with byte error detection capability, i.e., SEC-DED-SbED code, and at the same time it detects and corrects errors in the data stored in SRAM. The simplified 1-out-of-n check processes association errors. The graceful degradation gives a flag in the faulty memory section and prevents it from being used. The methods proposed in this paper are evaluated from area augmentation and error detection capability perspectives. The results show that the fault-tolerant TLB with 32 virtual address bits, 32 physical address bits and 128 entries gives single fault detection probability of nearly 99 percent with 28 percent area increase.

关键词： CAM TLB DISTANCE SEPARABLE TECHNIQUE CODING TECHNIQUE SIMPLIFIED 1-OUT-OF-N CHECK GRACEFUL DEGRADATION