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Continuous-variable quantum key distribution over 28.6 km fiber with an integrated silicon photonic receiver chip

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arXiv 2024年

作者： Bian, Yiming Pan, Yan Xu, Xuesong Zhao, Liang Li, Yang Huang, Wei Zhang, Lei Yu, Song Zhang, Yichen Xu, Bingjie State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing100876 China

Quantum key distribution, which ensures information-theoretically secret key generation, is currently advancing through photonic integration to achieve high performance, cost reduction and compact size, thereby facilitating the large-scale deployment. Continuous-variable quantum key distribution is an attractive approach for photonic integrations due to its compatibility with off-the-shelf optical communication devices. However, its chip-based systems have encountered significant limitations primarily related to the shot-noise-limited receiver design, which demands low noise, wide bandwidth, high clearance and well stability. Here, we report the implementation of a real local oscillator continuous-variable quantum key distribution system with an integrated silicon photonic receiver chip. Thanks to the well-designed chip-based homodyne detectors with a bandwidth up to 1.5 GHz and a clearance up to 7.42 dB, the transmission distance of the system has been extended to 28.6 km, achieving a secret key generation rate of Mbps level. This technological advancement enables the quantum key distribution systems with photonic integrated receivers to achieve the coverage in both access network scenarios and short-distance metropolitan interconnections, paving the way for the development of the next-generation quantum key distribution networks on a large scale. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum cryptography

Highly stable power control for chip-based continuous-variable quantum key distribution system

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arXiv 2024年

作者： Bian, Yiming Li, Yang Xu, Xuesong Zhang, Tao Pan, Yan Huang, Wei Yu, Song Zhang, Lei Zhang, Yichen Xu, Bingjie State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing100876 China

Quantum key distribution allows secret key generation with information theoretical security. It can be realized with photonic integrated circuits to benefit the tiny footprints and the large-scale manufacturing capacity. Continuous-variable quantum key distribution is suitable for chip-based integration due to its compatibility with mature optical communication devices. However, the quantum signal power control compatible with the mature photonic integration process faces difficulties on stability, which limits the system performance and causes the overestimation of secret key rate that opens practical security loopholes. Here, a highly stable chip-based quantum signal power control scheme based on a biased Mach-Zehnder interferometer structure is proposed, theoretically analyzed and experimentally implemented with standard silicon photonic techniques. Simulations and experimental results show that the proposed scheme significantly improves the system stability, where the standard deviation of the secret key rate is suppressed by an order of magnitude compared with the system using traditional designs, showing a promising and practicable way to realize highly stable continuous-variable quantum key distribution system on chip. Copyright © 2024, The Authors. All rights reserved.

关键词： Silicon photonics

Optimal Cyclic (r, δ) Locally Repairable Codes With r + δ − 1 =q+14 6

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Optimal Cyclic (r, δ) Locally Repairable Codes With r + δ ...

6th International Conference on communication, Image and Signal Processings, CCISP 2021

作者： Liu, Xing Zeng, Qi Hao, Yao Zhao, Yue Zhong, Jun Zhou, Limengnan College of Electrical Engineering College of Mathematics Sichuan University Chengdu610065 China College of Electrical Engineering Sichuan University Chengdu610065 China Science and Technology on Communication Security Laboratory Chengdu610041 China School of Electronic and Information Engineering UESTC Zhongshan Institute Zhongshan528400 China

ISBN: (纸本)9781665432795

Locally repairable codes (LRCs), due to the local erasure-correcting property, have been widely used in distributed storage systems. In this paper, we construct cyclic (r, δ) LRCs ((r, δ) CLRCs) which are optimal according to the Singleton-like bound. The locality of the new CLRCs satisfies that r + δ − 1 = q+14 . This is different from those of CLRCs obtained by Qian and Zhang in 2020 which are r + δ − 1 = q + 1 and r + δ − 1 =q+12 . Then the parameters of our CLRCs are new. © 2021 IEEE.

关键词： Multiprocessing systems

Phase noise model for continuous-variable quantum key distribution using a local local oscillator

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Physical Review A 2021年第3期104卷 032608-032608页

作者： Yun Shao Heng Wang Yaodi Pi Wei Huang Yang Li Jinlu Liu Jie Yang Yichen Zhang Bingjie Xu Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu 610041 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China

The value of residual phase noise, after phase compensation, is one of the key limitations of performance improvement for continuous-variable quantum key distribution using a local local oscillator (LLO CV-QKD) system, since it is the major excess noise. However, due to the nonideality of the realistic devices implemented in practice, for example, imperfect lasers, detectors, and unbalanced interferometers, the value of residual phase noise in the current system is still relatively large. Here, we develop a phase noise model to improve the phase noise tolerance of the LLO CV-QKD schemes. In our model, part of the phase-reference measurement noise associated with detection efficiency and electronic noise of Bob's detector as well as a real-time monitored phase-reference intensity at Bob's side is considered trusted because it can be locally calibrated by Bob. We show that using our phase noise model can significantly improve the secure key rate and transmission distance of the LLO CV-QKD system. We further conduct an experiment to substantiate the superiority of the phase noise model. Based on experimental data of a LLO CV-QKD system in the 25-km optical fiber channel, we demonstrate that the secure key rate under our phase noise model is approximately 40% higher than that under the conventional phase noise model.

关键词： Quantum cryptography

An Integrated Silicon Photonic Chip for Continuous-Variable Quantum Random Numbers Generator Based on Vacuum Fluctuation

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An Integrated Silicon Photonic Chip for Continuous-Variable ...

2021 International Conference on Advances in Optics and Computational sciences, ICAOCS 2021

作者： Zhu, Menglin Wang, Xiangyu Xu, Bingjie Yu, Song Chen, Ziyang Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics and Center for Quantum Information Technology Beijing100871 China Science and Technology on Communication Security Laboratory Institute of Southwestern Communication No. 6 Chuangye Road Chengdu610041 China

The deployment of quantum random number generator in fiber optics is strongly limited in real world applications due to the size of the components and their cost. Here we present a quantum random number generator based on vacuum fluctuation using an optical homodyne detection in silicon photonic chip achieving minimum entropy/bit of 8.5 for 10 bits sample. The produced random numbers have passed all NIST randomness tests. © Published under licence by IOP Publishing Ltd.

关键词： Random number generation

Blockchain-based Dynamic Group Management for Multiple Keywords Searchable Encryption technology 12

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Blockchain-based Dynamic Group Management for Multiple Keywo...

12th International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC 2020

作者： Chen, Yuxiang Bai, Jian Hao, Yao Liao, Sijie Yi, Zhongqiang Zhang, Hao Science and Technology on Communication Security Laboratory Chengdu610041 China No.30 Inst China Electronics Technology Group Corporation Chengdu610041 China China Electronics Technology Cyber Security Co. Ltd China

ISBN: (纸本)9781728184487

Searchable Encryption (SE) provides data online search function to users while protecting the data security and the user's query privacy. It has challenges of high computational and storage overhead that should be mitigated for a practical SE system. In this paper, we propose a blockchain-based user management scheme for SE system that can decentralize bandwidth resource consumption. Meanwhile it prevents single point failure and enhances the security protection in order to prevent identity leakage, loss, tampering brought by TTP. It leverages blockchain to offer non-central dynamic user management capability. Our theoretical analysis validates the feasibility and security. Further, experiments are carried out to demonstrate the SE effectiveness. © 2020 IEEE.

关键词： Cryptography

High-throughput decoder of quasi-cyclic LDPC codes with limited precision for continuous-variable quantum key distribution systems

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arXiv 2022年

作者： Zhou, Chuang Li, Yang Ma, Li Yang, Jie Huang, Wei Wang, Heng Luo, Yujie Lau, Francis C.M. Li, Yong Xu, Bingjie Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong College of Computer Science Chongqing University Chongqing400044 China

More than Mbps secret key rate was demonstrated for continuous-variable quantum key distribution (CV-QKD) systems, but real-time postprocessing is not allowed, which is restricted by the throughput of the error correction decoding in postprocessing. In this paper, a high-throughput FPGA-based quasi-cyclic LDPC decoder is proposed and implemented to support Mbps real-time secret key rate generation for CV-QKD for the first time. A residual bit error correction algorithm is used to solve the problem of high frame errors rate (FER) caused by the limited precision of the decoder. Specifically, real-time high-speed decoding for CV-QKD systems with typical code rates 0.2 and 0.1 is implemented on a commercial FPGA, and two throughputs of 360.92Mbps and 194.65Mbps are achieved, respectively, which can support 17.97 Mbps and 2.48 Mbps real-time generation of secret key rates under typical transmission distances of 25km and 50km, correspondingly. The proposed method paves the way for high-rate real-time CV-QKD deployment in secure metropolitan area network. Copyright © 2022, The Authors. All rights reserved.

关键词： Field programmable gate arrays (FPGA)

Research on the Detection Method of HOG-SVM for Doping Modified Hardware Trojan 4

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Research on the Detection Method of HOG-SVM for Doping Modif...

2020 4th International Workshop on Advanced Algorithms and Control Engineering, IWAACE 2020

作者： Sun, Chaolong Li, Lei Zhou, Wanting Tan, Xianjun He, Yuanhang UESTC Chengdu Sichuan611731 China Science and Technology on Communication Security Laboratory Institute of Southwest Communication Chengdu Sichuan610041 China Institute of Southwest Communication No. 8 Chuangye Road High-tech District Chengdu610041 China

With the globalization of the IC industry, hardware security has become an important topic, especially hardware Trojans (HT) hidden in ICs. In this paper, we presented the method based on histogram of oriented gradient (HOG) and support vector machine (SVM) to detect doping modified HTs, which is generally inserted by modifying the layout of some standard cells and is very difficult to detect. In order to address this problem, this paper firstly takes the standard layout without changing the doping polarity as the Trojan free (TF) layout, and regards the modified layout with changing the doping polarity as the HT layout, and then classifies the experimental data set into HT or TF by extracting the HOG features and using SVM training classification method. Experimental results demonstrate that the experimental accuracy of this method can reach 92.8%. © Published under licence by IOP Publishing Ltd.

关键词： Support vector machines

An Ultra-fast Quantum Random Number Generation Scheme Based on Laser Phase Noise

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arXiv 2023年

作者： Yang, Jie Wu, Mei Zhang, Yichen Liu, Jinlu Fan, Fan Li, Yang Huang, Wei Wang, Heng Pan, Yan Su, Qi Bian, Yiming Jiang, Haoyuan Dou, Jiayi Yu, Song Xu, Bingjie Luo, Bin Guo, Hong State Key Laboratory of Information Photonics and Optical Communications School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China Science and Technology on Security Communication Laboratory Institute of Southwestern Communication Chengdu610041 China State Key Laboratory of Cryptology Beijing100878 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

Based on the intrinsic random property of quantum mechanics, quantum random number generators allow for access of truly unpredictable random sequence and are now heading towards high performance and small miniaturization, among which a popular scheme is based on the laser phase noise. However, this scheme is generally limited in speed and implementation complexity, especially for chip integration. In this work, a general physical model based on wiener process for such schemes is introduced, which provides an approach to clearly explain the limitation on the generation rate and comprehensively optimize the system performance. We present an insight to exploit the potential bandwidth of the quantum entropy source that contains plentiful quantum randomness with a simple spectral filtering method and experimentally boost the bandwidth of the corresponding quantum entropy source to 20 GHz, based on which an ultra-fast generation rate of 218 Gbps is demonstrated, setting a new record for laser phase noise based schemes by one order of magnitude. Our proposal significantly enhances the ceiling speed of such schemes without requiring extra complex hardware, thus effectively benefits the corresponding chip integration with high performance and low implementation cost, which paves the way for its large-scale applications. © 2023, CC BY.

关键词： Random number generation