检索结果-内蒙古大学图书馆

Rate compatible reconciliation for continuous-variable quantum key distribution using Raptor-like LDPC codes

Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 26-34页

作者： Chao Zhou Xiang Yu Wang ZhiGuo Zhang Song Yu ZiYang Chen Hong Guo State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Advanced Optical Communication Systems and NetworksDepartment of Electronicsand Center for Quantum Information TechnologyPeking UniversityBeijing 100871China

In the practical continuous-variable quantum key distribution(CV-QKD)system,the postprocessing process,particularly the error correction part,significantly impacts the system ***-edge type low-density parity-check(MET-LDPC)codes are suitable for CV-QKD systems because of their Shannon-limit-approaching performance at a low signal-to-noise ratio(SNR).However,the process of designing a low-rate MET-LDPC code with good performance is extremely ***,we introduce Raptor-like LDPC(RL-LDPC)codes into the CV-QKD system,exhibiting both the rate compatible property of the Raptor code and capacity-approaching performance of MET-LDPC ***,this technique can significantly reduce the cost of constructing a new *** design the RL-LDPC matrix with a code rate of 0.02 and easily and effectively adjust this rate from 0.016 to *** results show that we can achieve more than 98%reconciliation efficiency in a range of code rate variation using only one RL-LDPC code that can support high-speed decoding with an SNR less than-16.45 d *** code allows the system to maintain a high key extraction rate under various SNRs,paving the way for practical applications of CV-QKD systems with different transmission distances.

关键词： continuous-variable quantum key distribution reconciliation Raptor-like LDPC codes

来源：评论

学校读者我要写书评

暂无评论

Improving Aircraft Engine Remaining Useful Life Prediction Scheme Based on Handcrafted Features and Neural Network Integration 5

Improving Aircraft Engine Remaining Useful Life Prediction S...

引用

5th International Conference on Machine Learning and Computer Application, ICMLCA 2024

作者： Bi, Dequan Bi, Meihua Qian, Lien Teng, Xuyang Hu, Miao School of Communication Engineering Hangzhou Dianzi University Zhe Jiang province Hangzhou310018 China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering Shanghai200240 China China Elect Technol Grp Corp Hangzhou China

ISBN: (纸本)9798331530334

The prediction of Remaining Useful Life (RUL) serves as a key indicator in the prognostics and health management of industrial equipment, holding significant implications for enhancing the availability of industrial equipment and reducing lifecycle costs. The common scheme based on the neural network especially for the Long Short-Term Memory (LSTM) networks can achieve satisfactory results in RUL prediction, while they are incapable of actively selecting key features and efficiently extracting degradation information embedded in the data. In this paper, we propose a new hybrid model based on LSTM networks. Here, the Convolutional Neural networks (CNN) is employed to extract key features, then a Bidirectional Long Short-Term Memory (BiLSTM) is utilized to capture long and short-term dependencies within the features. Besides, the attention mechanism is introduced to be applied to assign different weights to select important parts. In this way, by integrating the achieved statistical features, the accuracy of aircraft engine RUL prediction can be effectively enhanced. And, by experiment, our method is verified by carrying out on the C-MAPSS dataset. The corresponding results reveal that our approach is superior to the other reported neural network-based scheme, and it can be considered as one of the most promising schemes using for the RUL prediction of aircraft engine. © 2024 IEEE.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Extending the Reach of optical Interconnects with advanced Coded Modulation

Extending the Reach of Optical Interconnects with Advanced C...

引用

2023 Opto-Electronics and Communications Conference, OECC 2023

作者： Lei, Yi Wang, Xiang Lu, Qi Chen, Bin Hefei University of Technology School of Computer Science and Information Engineering Hefei China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks China

An advanced coded modulation is proposed based on improved staircase codes using marked bits and geometrically-shaped constellations. Up to 0.95 dB SNR gain and 8.6% reach increase are achieved for beyond 800G data ce... 详细信息

ISBN: (纸本)9781665462136

关键词： Stairs

来源：评论

学校读者我要写书评

暂无评论

Mode Purity Analysis for the Vortex Beam Emitter

Mode Purity Analysis for the Vortex Beam Emitter

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Li, Fan-Hong Wang, Kai-Xin Li, He-Yi He, Tao Huang, Jin Zhang, Zi-Wen Zhu, Juan-Feng Chinese Academy of Space Technology Institute of Remote Sensing Satellite China Center for Carbon-Based Electronics China Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics China Singapore

ISBN: (纸本)9798350375909

Vortex beams have exhibited great potential in multiple areas such as optical tweezers, quantum entanglement, and nonlinear optics. Various approaches have been developed for generating vortex beams such as spiral phase plates. Recently, a novel approach based on chiral plasmons has been proposed, which generates vortex beams with multiple topological charges (TC) in broad tunable bands. In this study, we investigate the mode purity of the vortex beams emitted by this approach. Using the Finite-Difference Time-Domain method, we calculate the purity of various modes in a broad frequency band. It verifies the approach can generate high-purity vortex beams with various TCs in the broadband. This study about the mode purity analysis contributes to further applications of vortex beams generated using the approach based on chiral plasmons. © 2024 IEEE.

关键词： Quantum entanglement

来源：评论

学校读者我要写书评

暂无评论

A Faraday laser based on corner-cube retroreflector

A Faraday laser based on corner-cube retroreflector

引用

2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Wang, Zhiyang Liu, Zijie Shi, Hangbo Qin, Xiaomin Guan, Xiaolei Shi, Tiantian Chen, Jingbiao State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing100871 China School of Integrated Circuits Peking University Beijing100871 China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Beijing100871 China Hefei National Laboratory Hefei230088 China

We present a single-mode Faraday laser based on the corner-cube retroreflector, whose wavelength can correspond to the atomic transition line. The linewidth can be narrowed below 10 kHz, and the maximum wavelength cha... 详细信息

ISBN: (纸本)9781957171395

关键词： Atoms

来源：评论

学校读者我要写书评

暂无评论

Impact Analysis of Multi-Path Interference on Real-Time 5G Front-Haul Transmission system with 50Gbit/s IM-DD Transceivers

Impact Analysis of Multi-Path Interference on Real-Time 5G F...

引用

2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Sheng, Xia Liu, Hao Wu, Yangbo Zhuge, Qunbi Zhang, Anxu Lv, Kai Feng, Lipeng Liu, Yuyang Huo, Xiaoli Li, Junjie Feng, Jia Tan, Bowen China Telecom Research Institute State Key Laboratory of Optical Fiber and Cable Manufacture Technology Beijing China Huawei Technologies Co. Ltd Shanghai China Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai China

We establish a realtime 5G front-haul system with 50Gbit/s transceivers to illustrate the impact of multi-path interference. The experimental results demonstrate that the performance significantly degrades when the MP... 详细信息

ISBN: (纸本)9798350312614

关键词： front-haul transmission system multi-path interference

来源：评论

学校读者我要写书评

暂无评论

Experimental determination of the diffusion coefficient in a coated cell

引用

Physical Review A 2024年第6期109卷 062814-062814页

作者： Junhe Zheng Ekrem Abdukerim Baichuan Li Teng Wu Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing 100871 China

The motional averaging effect of the alkali-metal atoms in a coated cell is influenced by the non-negligible background gas and is characterized by the diffusion coefficient of the alkali-metal atoms. In this paper, we present an experimental approach to measure the atomic diffusion coefficient within a paraffin coated cell through analyzing the spin relaxation caused by first-order and second-order magnetic-field gradients, respectively, given the distinct dependencies of these two relaxation effects on the diffusion coefficient. The diffusion coefficient is measured to be 0.137m2/s for the fabricated paraffin coated cell, indicating an estimated pressure of background gas at approximately 0.25Pa, which is orders of magnitude higher than the typical saturated vapor pressure of the alkali-metal atoms. Our work serves as a potential nondestructive method for analyzing the background gas pressure and offers new insights into the performance characterization of the coated cell.

关键词： Atomic & molecular processes in external fields Atomic spectra optical pumping Zeeman effect

来源：评论

学校读者我要写书评

暂无评论

Multiple-quadrature-amplitude-modulation continuous-variable quantum key distribution realization with a downstream-access network

引用

Physical Review A 2024年第5期109卷 052429-052429页

作者： Junyu Zhang Xiangyu Wang Fan Xia Song Yu Ziyang Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics and Center for Quantum Information Technology Peking University Beijing 100871 China

Quantum networks based on quantum key distribution ensure the security which is guaranteed by the fundamental laws of quantum physics between multiple parties. The discrete-modulation (DM) continuous-variable quantum key distribution (CV-QKD) protocols have the characteristics of simple implementation and compatibility with classical digital communication, making them very suitable for deployment in large-scale communication networks. However, the actual communication network has a huge communication capacity and a large number of units. To solve this problem, we propose a multiple-quadrature-amplitude-modulation (MQAM) DM protocol with a numerical method and complete the security analysis of the DM protocol in a downstream-access network situation. By introducing an extra dimension of signal modulation, the high-order modulated MQAM protocol greatly improves the number of supported units and the key rate of each unit. We give the results of a 16 quadrature amplitude modulation CV-QKD protocol in a downstream-access network which achieves 64 supported network units even in the case of high excess noise, which shows the application prospects of high-order discrete-modulation CV-QKD in network security.

关键词： Quantum cryptography Quantum information theory Quantum networks

来源：评论

学校读者我要写书评

暂无评论

A Faraday laser based on corner-cube retroreflector

A Faraday laser based on corner-cube retroreflector

引用

CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Linewidth

来源：评论

学校读者我要写书评

暂无评论

Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phases shift

引用

Light(Science & Applications) 2022年第11期11卷 2646-2654页

作者： Hongwei Wang Gujing Tang Yu He Zhen Wang Xingfeng Li Lu Sun Yong Zhang Luqi Yuan Jianwen Dong Yikai Su State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University200240 ShanghaiChina State Key Laboratory of Optoelectronic Materials and Technologies&School of Physics Sun Yat-sen University510275 GuangzhouChina School of Physics and Astronomy Shanghai Jiao Tong University200240 ShanghaiChina

Topologically protected edge states based on valley photonic crystals(VPCs)have been widely studied,from theoretical verifcation to technical ***,research on integrated tuneable topological devices is still ***,we study the phase-shifting theory of topological edge modes based on a VPC *** from the phase vortex formed by the VPC structure,the optical path of the topological edge mode in the propagation direction is approximately two-fold that of the conventional optical mode in a strip *** experiments,we show a 1.57-fold improvement inπ-phase tuning *** leveraging the highefficiency phase-shifting properties and the sharp-turn features of the topological waveguide,we demonstrate an ultracompact 1×2 thermo-optic topological switch(TOTS)operating at telecommunication wavelengths.A switching power of 18.2 mW is needed with an ultracompact device footprint of 25.66×28.3μm in the wavelength range of 1530-1582 *** the best of our knowledge,this topological photonic switch is the smallest switch of any dielectric or semiconductor 1×2/2×2 broadband optical switches,including thermo-optic and electro-optic *** addition,a high-speed transmission experiment employing the proposed TOTS is carried out to demonstrate the robust transmission of high-speed *** work reveals the phase shifting mechanism of valley edge modes,which may enable diverse topological functional devices in many fields,such as optical communications,nanophotonics,and quantum information processing.

关键词： waveguide tuning valley

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：