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International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Zi-Wen Zhang Chao-Hai Du Yu-Lu Lei Juan-Feng Zhu Yu Zhu Fan-Hong Li Shi-Pan Center for Carbon-Based Electronics and State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University

The vortex Smith-Purcell radiation with topological charge (TC) of 0 and −2 is proposed based on spoof surface plasmons (SSPs) carrying orbital angular momentums (OAMs) in this work. Due to the chirality of the helical grating, their eigenmodes are a series of SSPs carrying OAMs concerning the harmonic order. By customizing the slot depths over two propagation periods, these SSPs are exposed to the light cone. When the swift electrons skim over the grating and the wavenumber-matching conditions are met between the electron and SSPs carry ±1ℏ, the vortex beams with TCs = 0 and −2 are emitted into the free space with broadband tunability. The proposed method and validation may prompt the development of mode-division multiplexed communications and chiral detections based on vortex beams.

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Net 1-Tb/s/lambda PS-256-QAM coherent transmission with a 3-MHz DFB laser enabled by residual carrier modulation

Net 1-Tb/s/lambda PS-256-QAM coherent transmission with a 3-...

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49th European Conference on optical communications (ECOC 2023)

作者： X. Fang Y. Zhu X. Cai W. Hu Z. He F. Zhang State Key Laboratory of Advanced Optical Communication System and Networks Frontiers Science Centre for Nano-optoelectronics School of Electronics Peking University Beijing 100871 People's Republic of China State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai 200240 People's Republic of China Peng Cheng Laboratory Shenzhen 518055 People's Republic of China

We propose a residual-carrier modulation scheme for carrier frequency and phase recovery. With a low-cost 3-MHz linewidth DFB laser, we demonstrate a net rate of 1-Tb/s PS-256-QAM transmission over 80-km SSMF. The pro...

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Beam-scanning Antenna with High Chirality

Beam-scanning Antenna with High Chirality

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Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSRWTC)

作者： Yu-Lu Lei Yue-Yi Zhang Zi-Wen Zhang Chao-Hai Du Center for Carbon-based Electronics State Key Laboratory of Advanced Optical Communication Systems Networks School of Electronics Peking University

Chirality finds applications in various fields such as communication, sensing, and detection. However, existing methods have limitations in generating highly circular polarized radiation. In this study, we have introduced a novel approach to achieve highly circularly polarized radiation. Based on the spin momentum locking property of the spoof surface plasmon polaritons, a set of cylinders is introduced to facilitate the coupling of the strongly confined surface wave into radiation. This radiation carries spin angular momentum, which aligns with the transverse spin angular momentum, resulting in circular polarization. The proposed structure also enables beam scanning functionality, which is experimentally validated through the fabrication of an antenna. Overall, our scheme holds promise for generating highly circularly polarized radiation with applications in a wide range of fields.

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Image reconstruction through a nonlinear scattering medium via deep learning

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Photonics Research 2024年第9期12卷 2047-2055页

作者： SHUO YAN YIWEI SUN FENGCHAO NI ZHANWEI LIU HAIGANG LIU XIANFENG CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Image reconstruction through the opaque medium has great significance in fields of biophotonics,optical imaging,mesoscopic physics,and optical *** researches are limited in the simple linear scattering ***,we develop a nonlinear speckle decoder network,which can reconstruct the phase information of the fundamental frequency wave via the nonlinear scattering ***,we validate the ability of our model to recover simple and complex structures by using MNIST and CIFAR data sets,*** then show that the model is able to restore the image information through different sets of nonlinear diffusers and reconstruct the image of a kind of completely unseen object *** proposed method paves the way to nonlinear scattering imaging and information encryption.

关键词： process nonlinear speckle

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Security analysis of mode-pairing quantum key distribution with flexible pairing strategy

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Optics Express 2025年第11期33卷 23939-23959页

作者： Yi-Fei Lu Yang Wang Yan-Yang Zhou Yu Zhou Xiao-Lei Jiang Xin-Hang Li Hai-Tao Wang Jia-Ji Li Chun Zhou Hong-Wei Li Yu-Yao Guo Lin-Jie Zhou Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography IEU Zhengzhou 450001 China wy@*** State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Lab of Navigation and Location Services Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China bws@***

Mode-pairing quantum key distribution (MP-QKD) is advantageous for long-distance secure communication, leveraging its simple implementation and quadratic scaling capacity. The post-measurement pairing in MP-QKD alleviates the photon-coincidence demands, which are essential for surpassing the fundamental limit to the key-rate transmission. In this work, we propose an improved decoy-state MP-QKD protocol featuring a flexible and efficient pairing strategy. We prove the security of the proposed scheme by presenting an entanglement model for decoy-state MP-QKD. The simulation results show that the secret key rate (SKR) can be enhanced among all distances. Notably, compared with the original scheme [Nature communication 13 , 3903 (2022) [ CrossRef ] ], the improvement of SKR is greater than 65% within 375 km in the asymptotic case and greater than 50% within 400 km in the finite case. And the achievable distance can be extended in the finite case, especially with a small block length. The simulation results demonstrate the high efficiency of the proposed scheme, which is expected to promote the practical applicability of MP-QKD. Furthermore, the entanglement model could provide a theoretical framework for further security and performance analysis of decoy-state MP-QKD.

关键词： Integrated photonics Phase compensation Phase estimation Quantum communications Quantum key distribution Variable optical attenuators

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Quantum Photonics Enhances Continuous Variable Quantum key Distribution

Quantum Photonics Enhances Continuous Variable Quantum Key D...

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2023 Photonics and Electromagnetics Research Symposium, PIERS 2023

作者： Li, Lang Wang, Tao Huang, Peng Zeng, Guihua Institute of Quantum Sensing and Information Processing School of Sensing Science and Engineering Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering 200240 China Shanghai Research Center for Quantum Sciences Hefei National Laboratory Shanghai201315 China

ISBN: (纸本)9798350312843

Continuous-variable quantum key distribution (CV-QKD) technology has the characteristics of high channel capacity and well compatibility with existing optical communication infrastructures, and has become an important implementation method of quantum secure communication. Quantum photonics technology provides a promising solution for the construction of low-cost, miniaturized, portable, scalable and highly stable CV-QKD systems that can be deployed at large scale [1]. Therefore, it is of great significance to research and build a chip-based CV-QKD system with higher integration, higher system performance and higher practical security for the development of high-performance and practical quantum secure communication technology. This paper mainly reports the latest progress of the research of on-chip CV-QKD system in terms of system practical security [2] and integration of high-performance light sources [3]. © 2023 IEEE.

关键词： Quantum cryptography

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Excitation of photon localization state with giant atom coupled in a waveguide-QED system

Excitation of photon localization state with giant atom coup...

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CLEO: Science and Innovations, S and I 2022

作者： Xiao, Han Wang, Luojia Li, Zheng-Hong Chen, Xianfeng Yuan, Luqi State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Department of Physics Shanghai University Shanghai200444 China

We study a theoretical model where light transports along a dynamically-modulated coupled-resonator waveguide interacting with a giant atom, and find a bound state where photon is localized and excited atom exhibits a... 详细信息

ISBN: (纸本)9781557528209

关键词： Waveguides

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Topologically protected strong photon-exciton coupling

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Physical Review A 2023年第4期108卷 043706-043706页

作者： Zhiyuan Qian Ye Chen Chao Peng State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics & Frontiers Science Center for Nano-optoelectronics Peking University Beijing 100871 China Peng Cheng Laboratory Shenzhen 518055 China

We propose that strong photon-exciton coupling performed by a plasmonic nanoantenna and a single emitter can be protected in the well-designed topological photonic structure as an environment. Topological robustness leads to a reduction of metal loss, which makes Rabi splitting much larger. The strong coupling regime gets more stable in the topological systems because the sensitivity characterized by Rabi splitting can always remain small compared to the sensitive nontopological systems. Moreover, we show that the Rabi splitting under topological protection is immune to defects or impurities that can destroy strong coupling in nontopological systems. This topologically protected strong coupling mechanism offers more improvement in the applications of on-chip quantum integration, single quantum sources, and quantum information processing.

关键词： Cavity quantum electrodynamics Plasmonics Topological effects in photonic systems

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An Algorithm Optimization Method for Time-interval Measurement with Linear optical Sampling

An Algorithm Optimization Method for Time-interval Measureme...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Ganbin Lu Ziyang Chen Dongrui Yu Xinbo Li Bin Luo Hong Guo State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics and Center for Quantum Information Technology Peking University Beijing China

ISBN: (数字)9798350371901

ISBN: (纸本)9798350371918

The precise time interval measurement is the key in many applications. Recent-developed linear optical sampling method has pushed the time interval measurement to the femtosecond region. However, technique noise limits the precision improvements. To further optimize the precision of the time interval measurement scheme based on linear optical sampling, here we give an algorithm method to optimize the effective low-noise region of waveform and achieve the measurement stability of 22.9 fs.

关键词： Ultrasonic variables measurement Noise Optimization methods optical variables measurement optical variables control Sampling methods Time measurement Ultrafast optics optical noise Gravity

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A Voigt laser operating on 87Rb 780 nm transition

arXiv

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arXiv 2023年

作者： Liu, Zijie Guan, Xiaolei Qin, Xiaomin Wang, Zhiyang Shi, Hangbo Zhang, Jia Miao, Jianxiang Shi, Tiantian Dang, Anhong Chen, Jingbiao State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics School of Electronics Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

We report the development of laser systems- a "Voigt laser" - using a Voigt anomalous dispersion optical filter as the frequency-selective element, working at the wavelength of 780 nm of 87Rb-D2 resonance line. Compared with Faraday anomalous dispersion optical filter, the Voigt anomalous dispersion optical filter can generate a stronger and more uniform magnetic field with a compact size of magnet, and obtains a transmission spectrum with narrower linewidth and more stable lineprofile. In this case, the frequency stability of the Voigt laser reaches 5×10−9 at the averaging time of 200 s, and the wavelength fluctuation of 8-hours free operation is ± 0.1 pm. Besides, the Voigt laser has greater immunity to diode current than the Faraday laser, with a wavelength fluctuation of ± 0.5 pm in the current range from 73 mA to 150 mA. Finally, the Voigt laser frequency can be controlled by the cell temperature of the Voigt optical filter, which is expected to achieve a frequency detuning of 20 GHz. Consequently, the Voigt laser, whose frequency could correspond to the atomic transition frequency by tuning the cell temperature, obtains good robustness to the current and temperature fluctuation of laser diode, and could realize a compact optical standard for precise measurement once stabilized by modulation transfer spectroscopy. Copyright © 2023, The Authors. All rights reserved.

关键词： optical filters

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