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Continuous-Variable Quantum key Distribution with Rateless Reconciliation Protocol

Physical Review Applied 2019年第5期12卷 054013-054013页

作者： Chao Zhou Xiangyu Wang Yichen Zhang Zhiguo Zhang Song Yu Hong Guo State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics and Center for Quantum Information Technology Peking University Beijing 100871 China

Information reconciliation is crucial for continuous-variable quantum key distribution (CV QKD) because its performance affects the secret key rate and maximal secure transmission distance. Fixed-rate error-correction codes limit the potential applications of the CV QKD because of the difficulty of optimizing such codes for different low SNRs. In this Paper, we propose a rateless reconciliation protocol combined multidimensional scheme with Raptor codes that not only maintains the rateless property but also achieves high efficiency in different SNRs using just one degree distribution. It significantly decreases the complexity of optimization and increases the robustness of the system. Using this protocol, the CV QKD system can operate with the optimal modulation variance, which maximizes the secret key rate. Simulation results show that the proposed protocol can achieve reconciliation efficiency of more than 95% within the range of SNR from −20 to 0 dB. It also shows that we can obtain a high secret key rate at arbitrary distances in a certain range and achieve a secret key rate of about 5×10−4 bits/pulse at a maximum distance of 132 km (corresponding SNR is −20 dB) that is higher than previous works. The proposed protocol can maintain highly efficient key extraction under the wide range of SNRs and paves the way toward the practical application of CV QKD systems in flexible scenarios.

关键词： Photonics Quantum communication Quantum cryptography Quantum information processing with continuous variables Quantum networks Quantum optics

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Distributed Vibration Sensor With Laser Phase-Noise Immunity by Phase-Extraction φ-OTDR

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Photonic Sensors 2019年第3期9卷 223-229页

作者： Yuying SHAO Huanhuan LIU Peng PENG Fufei PANG Guoqin YU Zhen CHEN Na CHEN Tingyun WANG State Grid Shanghai Municipal Electric Power Company Shanghai 200072 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 Shanghai 200444 China

We have demonstrated a distributed vibration sensor based on phase-sensitive optical time-domain reflectometer (φ-OTDR) system exhibiting immunity to the laser phase noise. Two laser sources with different linewidth and phase noise levels are used in the φ-OTDR system, respectively. Based on the phase noise power spectrum density of both lasers, the laser phase is almost unchanged during an extremely short period of time, hence, the impact of phase noise can be suppressed effectively through phase difference between the Rayleigh scattered light from two adjacent sections of the fiber which define the gauge length. Based on the phase difference method, the external vibration can be located accurately at 41.01 km by the(φ-OTDR system incorporating these two lasers. Meanwhile, the average signal-to-noise ratio (SNR) of the retrieved vibration signal by using Laser I is found to be -37.7 dB, which is comparable to that of -37.5 dB by using Laser II although the linewidth and the phase noise level of the two lasers are distinct. The obtained results indicate that the phase difference method can enhance the performance of(φ-OTDR system with laser phase-noise immunity for distributed vibration sensing, showing potential application in oil-gas pipeline monitoring, perimeter security, and other fields.

关键词： Distributed vibration sensing optical time domain reflectometer fiber sensor phase noise

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Ultra-compact silicon-graphene waveguide device for high-speed wavelength conversion

Ultra-compact silicon-graphene waveguide device for high-spe...

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45th European Conference on optical communication (ECOC 2019)

作者： Yuxing Yang Qingming Zhu Shaohua An Lu Sun Yikai Su State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

We experimentally demonstrate an ultra-compact silicon-graphene wavelength converter at a 28-Gb/s data rate. A four-wave mixing conversion efficiency of −28 dB is achieved in the silicon-graphene strip waveguide with ...

ISBN: (纸本)9781839531859

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A MEMS fiber-optic Fabry-Perot accelerometer with spectral-phase demodulation

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Optics & Laser Technology 2025年 191卷

作者： Changquan Zhuang Tao Jin Jingya Zhang Heming Wei Mengshi Zhu Liang Zhang Fufei Pang Shijie Zheng Dengwei Zhang Kok-Sing Lim Carlos Marques Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai University Shanghai 200444 China State Key Laboratory of Extreme Photonics and Instrumentation Zhejiang University Hangzhou 310027 China MOE Key Laboratory of High-Speed Railway Engineering School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China The Photonics Research Centre University of Malaya Kuala Lumpur 50603 Malaysia CICECO – Aveiro Institute of Materials Physics Department University of Aveiro 3810-193 Aveiro Portugal Department of Physics VSB—Technical University of Ostrava Ostrava 70800 Czech Republic

In this work, a wideband Fabry-Perot accelerometer based on MEMS diagram was proposed and designed. The central mass block was elastically connected to a 2.8 mm outer frame through four curved beams to construct a single degree of freedom vibration system. Based on finite element simulation, the structural parameters of the four-arm bending beam diaphragm are optimized to broaden the operating frequency band while improving sensitivity. The structural stability of the sensor is ensured by leveraging MEMS processing technology, and miniaturized packaging is realized through the application of ceramic brackets. Moreover, a spectral-phase demodulation algorithm is employed to enable high-resolution measurement with a large vibration range. Through the in-depth analysis of experimental data, it is concluded that the designed accelerometer has an intrinsic frequency of 6624 Hz, an axial sensitivity of 12.397 nm/g at 200 Hz, and a lateral crosstalk of approximately 6.91 %. The working range of the accelerometer is 0 ∼ 2000 Hz, with a resolution of 14.358 mg and a measurement range of ± 287 g. The accelerometer exhibits sensitive response capability, large dynamic range and high stability, demonstrating great potential for application in diverse fields such as aerospace, mechanical and civil engineering.

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Sub-nє Static Resolution Fiber Laser Sensor

Sub-nє Static Resolution Fiber Laser Sensor

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Conference on Lasers and Electro-Optics (CLEO)

作者： Shuangxiang Zhao Qingwen Liu Jiageng Chen Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

A fiber laser sensor system capable of both static and dynamic strain measurement is presented. Using Pound-Drever-Hall and injection-locking techniques, resolution of 276 pε in 1000 s and 450 fε at 1 kHz is demonst... 详细信息

ISBN: (纸本)9781728137186

关键词： Strain Semiconductor lasers Measurement by laser beam Distributed feedback devices Fiber lasers Temperature measurement Strain measurement

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Excite atom-photon bound state inside the coupled-resonator waveguide coupled with a giant atom

arXiv

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arXiv 2021年

作者： Xiao, Han Wang, Luojia Li, Zhenghong 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 Zhejiang Province Key Laboratory of Quantum Technology and Device Zhejiang University Hangzhou310027 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Jinan Institute of Quantum Technology Jinan250101 China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal University Jinan250358 China

It is of fundamental interest in controlling the light-matter interaction for a long time in the field of quantum information processing. However, usual excitation with the propagating photon can hardly excite a localized state of light while keeping the atom under a subradiant decay in an atom-waveguide system. Here, we propose a model of coupling between a giant atom and the dynamically-modulated coupled-resonator waveguide and find that a bound state, where the light shows the localization effect and atom exhibits a subradiant decay time, can be excited by a propagating photon. An analytical treatment based on the separation of the propagating states and localized states of light has been used and provides inspiring explanation of our finding, i.e., a propagating photon can be efficiently converted to the localized light through the light-atom interactions in three resonators at frequency difference precisely equivalent to external modulation frequency. Our work therefore provides an alternative method for actively localizing the photon in a modulated coupled-resonator waveguide system interacting with giant atom, and also points out a way to study the light-atom interaction in a synthetic frequency dimension that holds the similar Hamiltonian. Copyright © 2021, The Authors. All rights reserved.

关键词： Atoms

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20Gb/s PAM-4 Generation by Modulating a Single-Drive Push-Pull Silicon Dual-Ring Modulator with 3Vpp

20Gb/s PAM-4 Generation by Modulating a Single-Drive Push-Pu...

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Dongsheng Zheng Ciyuan Qiu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China

We investigate the enhanced modulation efficiency of a silicon dual-ring modulator. Benefiting from single-drive push-pull configuration, 4-level pulse amplitude modulation is experimentally demonstrated at a bit rate... 详细信息

ISBN: (纸本)9781943580705

关键词： Erbium doped fiber amplifiers Modulation Modulators Ring resonators Signal transmission Silicon modulators

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An Ultra-compact Broadband TE-pass Nanofocusing Structure

An Ultra-compact Broadband TE-pass Nanofocusing Structure

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Asia communications and Photonics Conference and Exhibition (ACP)

作者： Kejian Zhu Xu Pengfei Pengfei Sun Xingpeng Liu Haiou Li Zhiping Zhou Nano-optoelectronics Frontier Center of Ministry of Education Peking University Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic Technology Guilin China

We propose a broadband structure which integrates polarization and nanofocusing functions into a single device with 3.8x4 μm 2 footprint. The bandwidth is over 200 nm with insert loss (IL) smaller than 1.68 dB. ... 详细信息

ISBN: (数字)9781943580828

ISBN: (纸本)9781728176567

关键词： Bandwidth Nanoscale devices optical fiber communication Broadband communication system-on-chip Photonics Periodic structures

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Quantum Noise of Kramers-Kronig Receiver

arXiv

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arXiv 2020年

作者： Zhang, Fan Zheng, Jiayu Kang, Haijun Sun, Fengxiao He, Qiongyi Su, Xiaolong State Key Laboratory of Advanced Optical Communication System and Networks Frontiers Science Center for Nano-Optoelectronics School of Electronics Peking University Beijing100871 China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan030006 China State Key Laboratory for Mesoscopic Physics School of Physics Frontiers Science Center for Nano-Optoelectronics Collaborative Innovation Center of Quantum Matter Peking University Beijing100871 China Peng Cheng Laboratory Shenzhen518055 China

The Kramers-Kronig (KK) receiver provides an efficient method to reconstruct the complex-valued optical field by means of intensity detection given a minimum-phase signal. In this paper, we analytically show that for detecting coherent states through measuring the minimum-phase signal, while keeping the radial quantum fluctuation the same as the balanced heterodyne detection does, the KK receiver can indirectly recover the tangential component with fluctuation equivalently reduced to 1/3 times the radial one at the decision time, by adopting the KK relations to utilize the information of the physically measured radial component of other time of the symbol period. In consequence, the KK receiver achieves 3/2 times the signal-to-noise ratio of balanced heterodyne detection, while presenting an asymmetric quantum fluctuation distribution depending on the time-varying phase. Therefore, the KK receiver provides a feasible scheme to reduce the quantum fluctuation for obtaining the selected component to 2/3 times that of physically measuring the same component of the coherent state. This work provides a physical insight of the KK receiver and should enrich the knowledge of electromagnetic noise in quantum optical measurement. Copyright © 2020, The Authors. All rights reserved.

关键词： Heterodyne detection

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optical-lattice-based Cs active clock with a continual superradiant lasing signal

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Physical Review A 2020年第4期102卷 041101(R)-041101(R)页

作者： Duo Pan Bindiya Arora Yan-mei Yu B. K. Sahoo Jingbiao Chen State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Peking University Beijing 100871 China Department of Physics Guru Nanak Dev University Amritsar Punjab 143005 India Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences 100049 Beijing China Atomic Molecular and Optical Physics Division Physical Research Laboratory Navrangpura Ahmedabad 380009 India

We demonstrate the state-of-the-art technique of an active clock to provide a continuous superradiant lasing signal using an ensemble of trapped Cs atoms in an optical lattice. A magic wavelength of the proposed |7S1/2;F=4,MF=0〉→|6P3/2;F=3,MF=0〉 clock transition in Cs atoms is identified at 1181 nm for constructing the optical lattice. Pertinent optical lines are also found for pumping and repumping atoms from their ground states. A fractional uncertainty about 10−15 in the clock frequency has been predicted by carrying out rigorous calculations of several atomic properties. The bad-cavity operational mode of the active clock is anticipated to improve remarkably its short-term stability by suppressing intrinsic thermal fluctuations. Thus, a composite clock system with better short-term and long-term stabilities can be built by combining the proposed active clock with another high-accuracy passive optical clock.

关键词： Atomic, optical & lattice clocks

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