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Single-Photon Transport in a Topological Waveguide from a Dynamically Modulated Photonic system

Physical Review Applied 2020年第1期14卷 014063-014063页

作者： Luojia Wang Luqi Yuan Xianfeng Chen Shanhui Fan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal University Jinan 250358 China Department of Electrical Engineering and Ginzton Laboratory Stanford University Stanford California 94305 USA

The topologically protected one-way edge modes for light show a way to manipulate the interaction between a single photon and a quantum emitter. We systematically study single-photon quantum optics in a topological waveguide supporting the frequency-dependent one-way edge mode at the boundary of a dynamically modulated photonic system, and compare the results of the single-photon interacting dynamics with the quantum emitter in a unidirectional waveguide. As a major difference, a photon in a topological waveguide propagates around the resonant site coupled to the quantum emitter due to the topological protection. Our results show that, despite different subtleties, photon-emitter interactions for one photon at the edge mode and for one photon propagating in a unidirectional waveguide hold similar features. In addition, we consider the interaction between the photon and a Λ-type three-level quantum emitter in the topological waveguide, where we show the nonlocal correlated photon-state generation as well as the single-photon reflection with the frequency conversion. Our work provides insight for understanding the interaction between the topologically protected unidirectional-propagating photon and the quantum emitter, which holds promise for potential applications in quantum-information processing.

关键词： Edge states optical quantum information processing Quantum correlations in quantum information Quantum optics Single photon sources Topological effects in photonic systems Waveguides 2-dimensional systems

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Femtosecond fiber laser at 780 nm for two-photon autofluorescence imaging

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Chinese Optics Letters 2019年第7期17卷 63-65页

作者： Wan Yang Danlei Wu Runlong Wu Guanyu Liu Bingying Chen Lishuang Feng Zhigang Zhang Aimin Wang State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 1008711 China Key Laboratory of Precision Opto-Mechatronics Technology Ministry of EducationSchool of Instrumentation Science&Optoelectronics EngineeringBeihang UniversityBeijing 100191China

We present an Er-doped fiber(Er:fiber)-based femtosecond laser at 780 nm with 256 MHz repetition rate, 191 fs pulse duration, and over 1 W average *** from the careful third-order dispersion management, we introduce moderate self-phase modulation to broaden the output spectrum of the Er:fiber amplifier and achieve 193 fs pulse duration and 2.43W average *** 40% frequency doubling efficiency is obtained by a periodically poled lithium niobate *** through a hollow-core photonic bandgap fiber, this robust laser becomes an ideal and convenient light source for two-photon autofluorescence imaging.

关键词： Femtosecond fiber laser two-photon autofluorescence imaging

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Active spoof plasmonic resonator based on metal-insulator-metal structure 5

Active spoof plasmonic resonator based on metal-insulator-me...

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5th IEEE International Conference on Computational Electromagnetics, ICCEM 2019

作者： Li, Qiao Yu Cai, Jing Zhou, Yong Jin School of Communication and Information Engineering Shanghai University Shanghai200444 China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai200444 China State Key Laboratory of Transducer Technology Chinese Academy of Sciences Shanghai200050 China

ISBN: (纸本)9781538671115

An active spoof plasmonic resonator is proposed, which mainly loads the microwave active amplifier chip on the metal-insulator-metal (MIM) resonator. It was expected that the losses of the structure could be compensated by adjusting the biased voltage of the chip, so as to improve the resonant strength and quality factor of the resonator. Although the simulation and experimental results of the passive structures agree well, the results of the active structure when the biased voltage is applied did not match expectations and the Q factor of only one mode is improved. More works will be done to further improve the performances. © 2019 IEEE.

关键词： Metal insulator boundaries

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Boosting higher secret key rate in quantum key distribution over mature telecom components

Research Square

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Research Square 2021年

作者： Wang, Tao Huang, Peng Li, Lang Zhou, Yingming Zeng, Guihua State Key Laboratory of Advanced Optical Communication Systems and Networks Center for Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai200240 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Hefei National Laboratory CAS Center for Excellence in Quantum Information and Quantum Physics Anhui Hefei230026 China Shanghai XunTai Quantech Co. Ltd Shanghai200241 China

Secret key rate is a core performance indicator in implementing quantum key distribution, which directly determines the transmission rate of enciphered data. Here we demonstrate a high-key-rate quantum key distribution system over mature telecom components. The entire framework of quantum key distribution over these components is constructed. The high-rate low-noise Gaussian modulation of coherent states is realized by a classical electro-optic IQ modulator. High-baud low-intensity quantum signals are received by a commercial integrated coherent receiver under the shot-noise limit. A series of digital signal processing algorithms are proposed to achieve accurate signal recovery and key distillation. The system has yield a secret key rate of 10.37 Mbps, 1.61 Mbps, 337.82 kbps, and 58.06 kbps under the standard telecom fiber of 20 km, 50 km, 70 km, and 100 km, respectively. Our results represent the achieved highest secret key generation rate for quantum key distribution using continuous variables at a standard telecom wavelength. Moreover, it breaks the isolation between quantum communication and classical optical communication in terms of components, and opens the way to a high-speed and cost-effective formation of metropolitan quantum secure communication networks. © 2021, CC BY.

关键词： Quantum cryptography

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Metasurface-assisted passive wireless communication with commodity wi-fi signals

arXiv

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arXiv 2020年

作者： Zhao, Hanting Shuang, Ya Wei, Menglin Cui, Tie Jun del Hougne, Philipp Li, Lianlin State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University Beijing100871 China State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China Institut de Physique de Nice CNRS UMR 7010 Université Côte d'Azur Nice06108 France

Wireless communication has become a standard solution to address ever-increasing demands for information transfer in our modern society. Conventional systems work in an active way in the sense that an active carrier signal is mandatorily required to transfer information from Alice to Bob. Especially in the era of 5G/6G and with the advent of the Internet of Things (IoT), an exponential growth of users and connectivity confronts conventional systems with important challenges including limited spectrum resources, information security, energy consumption and cost efficiency. Here, we introduce the fundamentally different concept of passive wireless communication (PWC) which has the potential to resolve the above-mentioned issues. PWC transfers digital information by modulating/demodulating already existing omnipresent ambient stray electromagnetic waves using a programmable metasurface. We provide a theoretical framework for encoding/decoding and modulating/demodulating in PWC and build a proof-of-principle prototype system leveraging existing commodity 2.4GHz Wi-Fi signals. We demonstrate information transfer from Alice to Bob with data rates on the order of hundreds of Kbps using distinguishable information-carrying control coding patterns of the metasurface, neither necessitating an active carrier signal and its associated radio-frequency chain nor affecting the background active wireless communication. The presented strategy is particularly appealing for "green" IoT connectivity. At the same time, the concept is applicable to all types of wave phenomena and provides a fundamentally new perspective on the design of future wireless communication architectures. Copyright © 2020, The Authors. All rights reserved.

关键词： Internet of things

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Mapping ultrafast timing jitter in dispersion-managed 89 GHz frequency microcombs via self-heterodyne linear interferometry

arXiv

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arXiv 2021年

作者： Wang, Wenting Liu, Hao Yang, Jinghui Vinod, Abhinav Kumar Lim, Jinkang Jang, Yoon-Soo Zhou, Heng Yu, Mingbin Lo, Patrick Guo-Qiang Kwong, Dim-Lee DeVore, Peter Chou, Jason Wong, Chee Wei Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of California Los AngelesCA90095 United States Key Lab of Optical Fiber Sensing and Communication Networks University of Electronic Science and Technology of China Chengdu611731 China Institute of Microelectronics A*STAR Singapore117865 Singapore State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Shanghai Industrial Technology Research Institute Shanghai China Advanced Micro Foundry Singapore117685 Singapore Lawrence Livermore National Laboratory LivermoreCA94550 United States

Laser frequency microcombs provide equidistant coherent frequency markers over a broad spectrum, enabling new frontiers in chip-scale frequency metrology, laser spectroscopy, dense optical communications, precision distance metrology and astronomy. Here we demonstrate thermally stabilized frequency microcomb formation in dispersion-managed microresonators at the different mode-locking states featured with the negligible center frequency shift and broad frequency bandwidth. Subsequently, femtosecond timing jitter in the microcombs are characterized, supported by precision metrology on the timing phase, relative intensity noise and instantaneous linewidth. We contrast the fundamental noise for a range of 89 GHz microcomb states, from soliton crystals to multiple solitons and single-soliton regimes, determined by pump-resonance detuning. For the single-soliton state, we report a close-to-shot-noise-limited relative intensity noise of -153.2 dB/Hz and a quantum-noise-limited timing jitter power spectral density of 0.4 as2/Hz, at 100 kHz offset frequency. This is enabled by a self-heterodyne linear interferometer with 94.2 zs/Hz1/2 timing resolution, 50.6 mHz/Hz1/2 RF frequency resolution, and 6.7 µV/Hz frequency discrimination sensitivity. We achieve an integrated timing jitter at 1.7 ± 0.07 fs, integrated from 10 kHz to 1 MHz. Measuring and understanding the fundamental noise parameters in these high-clock-rate frequency microcombs are essential to advance soliton physics and precision microwave-optical clockwork. Copyright © 2021, The Authors. All rights reserved.

关键词： Shot noise

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A Machine Learning Based Optimization Approach for Continuous-Variable Quantum key Distribution

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advanced Quantum Technologies 2025年

作者： Jiang, Xue-Qin Wang, Na Jin, Jiangliang Feng, Yan Hai, Han Dai, Jisheng Huang, Peng College of Information Science and Technology Donghua University Shanghai201620 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Hefei National Laboratory Hefei230088 China College of Electronic and Information Shanghai Dianji University Shanghai201306 China State Key Laboratory of Advanced Optical Communication Systems and Networks Institute for Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai200240 China

In the continuous-variable quantum key distribution (CV-QKD) system, the secret key rate and transmission distance are important factors to evaluate the quality of the system. Numerical methods are commonly employed to calculate the secret key rate of QKD, but they often face challenges to find the optimal parameter to enhance the secret key rate. In this study, a machine learning based parameter optimization approach is proposed for the Gaussian-modulated CV-QKD system. The proposed approach adopts the genetic algorithm backpropagation (GA-BP) based approach to enhance the secret key rate by optimize parameters of the CV-QKD system. Furthermore, under certain assumptions, some theoretical results are established, which enables us to identify the maximum secret key rate under a given GA-BP network. Based on these results, a bisection based method is proposed that can effectively find the optimal modulation variance and the corresponding maximum secret key rate. Finally, the simulation results show that the proposed approach can achieve a higher secret key rate than the conventional methods under the numerical settings. © 2025 Wiley-VCH GmbH.

关键词： Backpropagation

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Generative Adversarial Method Considering communication Transmission Distortion for Neural Network Codec

Generative Adversarial Method Considering Communication Tran...

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IEEE Conference on Vehicular Technology (VTC)

作者： Xiaolong Zheng Chuanchuan Yang Jiqiang Feng Chen Xu Ziyu Wang State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China The HD Video R & D Platform for Intelligent Analysis and Processing in Guangdong Engineering Technology Research Centre of Colleges and Universities Shenzhen China

ISBN: (数字)9781728194844

ISBN: (纸本)9781728194851

Recently, induced by incorporating the ubiquitous data collected by AI application, there are more and more demand for transferring data to cloud servers due to the restriction of computing resources of devices. To transfer image data efficiently, neural network (NN) codec can be a wise choice, which can result in higher ratio of compression with similar image quality compared with conventional codec methods. However, when the NN codec is employed in the communication system, it is likely that it can be disturbed by channel distortions. In this paper, we innovatively propose a norm method to measure the NN codec's robustness for certain tasks. And with the aid of this method, we develop a greedy algorithm using gradients to find adversarial samples of certain tasks considering communication system distortions, i.e. channel distortions during compressed image or video transferring to cloud server systems. Aided by the adversarial samples, the NN codec has been proved to have better tolerance of communication distortions that the Top-1 accuracy of the image classification can be improved 1.8%.

关键词： Codecs Image coding communication systems Artificial neural networks Distortion Servers Task analysis

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Photonic Microwave Oscillator based on an Ultra-stable-laser and an optical Frequency Comb

Photonic Microwave Oscillator based on an Ultra-stable-laser...

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European Conference on Microwave

作者： Michele Giunta Maurice Lessing Jialiang Yu Marc Fischer Matthias Lezius Xiaopeng Xie Giorgio Santarelli Yann Le Coq Ronald Holzwarth Menlo Systems GmbH Martinsried Germany Max-Planck-Institut für Quantenoptik Garching Germany Now at Physikalisch-Technische Bundesanstalt (PTB) Braunschweig Germany LNE-SYRTE Observatoire de Paris France Now at State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing China LP2N IOGS-CNRS-Universités de Bordeaux Talence France

ISBN: (数字)9782874870590

ISBN: (纸本)9781728170398

We present a transportable photonic microwave oscillator, porting optical stability to a 10 GHz microwave signal. The system is composed of two main sub-units: a compact 8 height-unit (HU) 194 THz ultra-stable laser with Hz linewidth showing a fractional frequency stability (modified Allan deviation) of 8.5 × 10 -15 at 1 s and a 3 HU ultra-low noise optical frequency comb used to phase-coherently divide the optical frequency reference's spectral purity down to a 10 GHz microwave signal. Characterizing the synthesized microwave by means of a commercial digital cross-correlator, a phase noise power spectral density of -70 dBc/Hz at 1 Hz and -160 dBc/Hz at 10 kHz Fourier frequency is measured, maintaining a white plateau at -165 dBc/Hz up to 10 MHz offset.

关键词： Microwave measurement Phase noise Masers Microwave oscillators Microwave amplifiers Microwave photonics Microwave filters

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UAV communication Channel Measurement, Modeling, and Application

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Journal of communications and Information networks 2019年第4期4卷 32-43页

作者： Xiang Cheng Yiran Li Lin Bai State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsSchool of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Shenzhen Research Institute of Big Data Shenzhen 518000China School of Cyber Science and Technology Beihang UniversityBeijing 100191China

As unmanned aerial vehicles(UAV)deploy-ment is shifting from military to civilian sectors,and in particular as a means of facilitating more flexible and versatile wireless communications,the UAV channels that were previously not well understood are attracting increasing research and *** the key component facilitating the UAV-aided communications,UAV channel characteristics and modeling are of critical importance to the designed UAV system to achieve satisfactory *** this article,we will provide a comprehensive overview and the future perspective of envisioned UAV communication system benefits,the existing and needed UAV channel measurements and modeling approaches,together with the new viewpoint of UAV channel applications in different communication and networking *** existing work and future directions are extensively covered.

关键词： UAV channel measurements modeling application future challenges

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