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3rd International Conference on Optics and Communication technology, ICOCT 2023

作者： Xiao, Xiao Zhang, Haitao Zhang, Jianquan Zhou, Guopeng Yu, Fengqi Lawrence, George N. Hu, Xuejiao Institute of Engineering and Technology Hubei University of Science and Technology Xianning437100 China Hubei Xiangcheng Intelligent Electromechanical Industry Technology Research Institute Co. Ltd. Xianning437100 China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Chinese University of Hong Kong Hong Kong Applied Optics Research 1087 Lewis River Rd. #217 WoodlandWA98674 United States Center for Energy and Thermal Management Research Institute of Tsinghua University Shenzhen518057 China Key Laboratory of Natural Gas Quality and Energy Measurement CNPC Chengdu610213 China

ISBN: (纸本)9781510672529

A novel Mach-Zehnder-interferometer (MZI)-based external cavity diode laser (ECDL) has been proposed and theoretically investigated in this study as a light source for tunable diode laser absorption spectroscopy (TDLAS). The proposed model can modulate the dual-arm optical path difference and the round-trip optical path length of the ECDL external cavity. The results demonstrate that the wavelengths of a certain MZI pass band center and the ECDL external cavity longitudinal mode may track each other over a significant range of voltage variation leading to mode-hop-free performance. Therefore, it can be used in the TDLAS system for gas detection and characterization and is expected to replace the DFB laser. © 2023 SPIE.

关键词： Distributed feedback lasers

Implementing Arbitrary Ising Models with a Trapped-Ion Quantum Processor

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Physical Review Letters 2025年第5期134卷 050602-050602页

作者： Yao Lu Wentao Chen Shuaining Zhang Kuan Zhang Jialiang Zhang Jing-Ning Zhang Kihwan Kim State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China International Quantum Academy Shenzhen 518048 China Department of Physics Renmin University of China 100872 Beijing China Beijing Academy of Quantum Information Sciences Beijing 100193 China MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics PGMF Institute for Quantum Science and Engineering School of Physics Huazhong University of Science and Technology 430074 Wuhan China Hefei National Laboratory Hefei 230088 People’s Republic of China Frontier Science Center for Quantum Information Beijing 100084 People’s Republic of China

A promising paradigm of quantum computing for achieving practical quantum advantages is quantum annealing or quantum approximate optimization algorithm, where the classical problems are encoded in Ising interactions. However, it is challenging to build a quantum system that can efficiently map any structured problems. Here, we present a trapped-ion quantum processor that can efficient encode arbitrary Ising models with all-to-all connectivity for up to four spins. We implement the spin-spin interactions by using the coupling of trapped ions to multiple collective motional modes and realize the programmability through phase modulation of the Raman laser beams that are individually addressed on ions. As an example, we realize several Ising models with different interaction connectivities, where the interactions can be ferromagnetic or antiferromagnetic. We confirm the programmed interaction geometry by observing the ground states of the corresponding models through quantum state tomography. Our experimental demonstrations serve as an important basis for realizing practical quantum advantages with trapped ions.

关键词： Ising model

Longitudinal-flexural composite axe-shaped sandwich piezoelectric ultrasonic transducer designed based on the principle of acoustic black hole

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Applied Acoustics 2025年 239卷

作者： Wen, Shihao Xu, Long Gong, Tao Zhang, Haidao Liang, Zhaofeng Yao, Lei College of Metrology and Measurement Engineering China Jiliang University Hangzhou310018 China College of Sciences China Jiliang University Hangzhou310018 China Zhejiang Key Laboratory of Acoustic Intelligent Sensing and Advanced Measurement State Administration for Market Regulation Hangzhou 310018 China Key Laboratory of Acoustics and Vibration Applied Measuring Technology State Administration for Market Regulation Hangzhou 310018 China Institute of Intelligent Manufacturing Technology Shenzhen Polytechnic University Shenzhen 518055 China

Utilizing the excellent performance of curved acoustic black hole (ABH) to capture and focus sound waves, we propose a novel longitudinal-flexural composite vibration axe-shaped sandwich piezoelectric ultrasonic transducer (AUT) with an ABH structure to focus the ultrasonic vibration energy onto the output end of the transducer. The transducer consists of a longitudinal vibration sandwich piezoelectric exciter (axe handle) and a flexural vibration ABH structure (axe head). By utilizing the longitudinal vibration of the handle to excite the second-order bending vibration of the axe, along with the acoustic black hole structure of the axe, the transducer achieves the capture of flexural waves and the concentration of acoustic energy at the tip of the axe. This ultimately generates a high displacement amplitude and high energy region at the output end of the transducer, enhancing its ultrasonic welding performance. An analytical theoretical model for the flexural vibration of the head and the longitudinal vibration of the handle was established using the transfer matrix method (TMM). Finite element simulations and experimental tests were conducted to validate the theoretical calculations. The results indicate that the acoustic black hole structure of the axe-shaped transducer can significantly enhance the displacement and achieve the focusing of acoustic energy at the output end the transducer. © 2025 Elsevier Ltd

关键词： Ultrasonic welding

Optical meta-waveguides for integrated photonics and beyond

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Light(Science & Applications) 2021年第12期10卷 2263-2306页

作者： Yuan Meng Yizhen Chen Longhui Lu Yimin Ding Andrea Cusano Jonathan A.Fan Qiaomu Hu Kaiyuan Wang Zhenwei Xie Zhoutian Liu Yuanmu Yang Qiang Liu Mali Gong Qirong Xiao Shulin Sun Minming Zhang Xiaocong Yuan Xingjie Ni State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information Science and TechnologyFudan UniversityShanghai 200433China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Electrical Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA Optoelearonic Division Department of EngineeringUniversity of Sannio1-82100 BeneventoItaly Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua University100084 BeijingChina Yiwu Research Institute of Fudan University Chengbei RoadYiwu City 322000 ZhejiangChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 HubeiChina

The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic *** integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits,giving rise to numerous metawaveguides with unprecedented strength in controlling guided electromagnetic ***,we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms,such as dielectric or plasmonic waveguides and optical *** results and representative applications are comprehensively *** physical models with explicit design tutorials,either physical intuition-based design methods or computer algorithms-based inverse designs,are cataloged as *** highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems,by enhancing light-matter interaction strength to drastically boost device performance,or offering a versatile designer media for manipulating light in nanoscale to enable novel *** further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits,biomedical sensing,artificial intelligence and beyond.

关键词： waveguides waveguide beyond

220 GHz RIS-Aided Multi-user Terahertz Communication System: Prototype Design and Over-the-Air Experimental Trials

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arXiv 2025年

作者： Hou, Yanzhao Wang, Guoning Chen, Chen Mu, Gaoze Cui, Qimei Tao, Xiaofeng Yang, Yuanmu National Engineering Laboratory for Mobile Networks Beijing University of Posts and Telecommunications Beijing100876 China Pengcheng Laboratory Shenzhen518055 China School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory for Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China

Terahertz (THz) communication technology is regarded as a promising enabler for achieving ultra-high data rate transmission in next-generation communication systems. To mitigate the high path loss in THz systems, the transmitting beams are typically narrow and highly directional, which makes it difficult for a single beam to serve multiple users simultaneously. To address this challenge, reconfigurable intelligent surfaces (RIS), which can dynamically manipulate the wireless propagation environment, have been integrated into THz communication systems to extend coverage. Existing works mostly remain theoretical analysis and simulation, while prototype validation of RIS-assisted THz communication systems is scarce. In this paper, we designed a liquid crystal-based RIS operating at 220 GHz supporting both single-user and multi-user communication scenarios, followed by a RIS-aided THz communication system prototype. To enhance the system performance, we developed a beamforming method including a real-time power feedback control, which is compatible with both single-beam and multi-beam modes. To support simultaneous multi-user transmission, we designed an OFDM-based resource allocation scheme. In our experiments, the received power gain with RIS is no less than 10 dB in the single-beam mode, and no less than 5 dB in the multi-beam mode. With the assistance of RIS, the achievable rate of the system could reach 2.341 Gbps with 3 users sharing 400 MHz bandwidth and the bit error rate (BER) of the system decreased sharply. Finally, an image transmission experiment was conducted to vividly show that the receiver could recover the transmitted information correctly with the help of RIS. The experimental results also demonstrated that the received signal quality was enhanced through power feedback adjustments. Copyright © 2025, The Authors. All rights reserved.

关键词： Bit error rate

Perturbational Decomposition Analysis for Quantum Ising Model with Weak Transverse Fields

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arXiv 2024年

作者： Li, Youning Huang, Junfeng Zhang, Chao Li, Jun College of Science China Agriculture University Beijing China Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous Integration Shenzhen University Shenzhen518060 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

This work presented a perturbational decomposition method for simulating quantum evolution under the one-dimensional Ising model with both longitudinal and transverse fields. By treating the transverse field terms as perturbations in the expansion, our approach is particularly effective in systems with moderate longitudinal fields and weak to moderate transverse fields relative to the coupling strength. Through systematic numerical exploration, we characterized parameter regimes and evolution time windows where the decomposition achieved measurable improvements over conventional Trotter decomposition methods. The developed perturbational approach and its characterized parameter space may provide practical guidance for choosing appropriate simulation strategies in different parameter regimes of the one-dimensional Ising model. © 2024, CC BY.

关键词： Ising model

Portable and Ultrasensitive Detection of Traces of Water in Alcoholic Solvents by a Polypyrrole-Modified Screen-Printed Electrode

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SSRN

SSRN 2024年

作者： Zhang, Kun Fan, Zhimin Feng, Xiaonan Hu, Ya Chen, Zheqian Wang, Shangqing Liu, Jingfu Zhang, Bintian Shenzhen Key Laboratory of Precision Measurement and Early Warning Technology for Urban Environmental Health Risks School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China School of Geography Earth & Environmental Sciences University of Birmingham BirminghamB15 2TT United Kingdom State Key Laboratory of Environmental Chemistry and Ecotoxicology China

In industrial production, the water content in alcoholic solvents is often crucial for determining the quality and yield of the final products, and excessive water can potentially lead to accidents. However, in-situ, rapid, and accurate detection of trace amounts of water in alcoholic solvents has been a persistent challenge. Herein, we report a screen-printed electrode (SPE) modified with electrosensitive polypyrrole (PPy@SPE), which enables rapid and ultrasensitive quantification of water content in four alcoholic solvents. The amine groups on PPy provide hydrogen bonding sites, which, in conjunction with the rough surface of the SPE, enhance the adsorption of alcohol molecules and decrease the electrochemical response of the PPy@SPE due to the hindrance of charge transfer. Under optimal conditions, the PPy@SPE can detect water levels as low as 0.02%, 0.01%, 0.01%, and 0.01%, in methanol, ethanol, n-propanol, and isopropanol, respectively, and can be reused for six cycles or more. Furthermore, the capability for on-situ detection of water in alcoholic solvents was demonstrated by integrating the PPy@SPE with a miniaturized potentiostat. With the advantages of being ultrasensitive, robust, low-cost, and facile detection, this sensor is potentially a valuable tool for on-site water content monitoring in chemical industries. © 2024, The Authors. All rights reserved.

关键词： Electrochemical sensors

Experimental Realization of Criticality-Enhanced Global Quantum Sensing via Non-Equilibrium Dynamics

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arXiv 2025年

作者： Yu, Yefei Liu, Ran Xue, Guangming Yang, Chuhong Wang, Chenlu Zhang, Jingning Cui, Jiangyu Yang, Xiaodong Li, Jun Han, Jiaxiu Yu, Haifeng Beijing Academy of Quantum Information Sciences Beijing100193 China Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Hefei National Laboratory Hefei230088 China Department of Modern Physics University of Science and Technology of China Hefei230026 China

Quantum critical systems offer promising advancements in quantum sensing and metrology, yet face limitations like critical slowing down and a restricted criticality-enhanced region. Here, we introduce a critical sensing scheme that mitigate critical slowing down by leveraging the non-equilibrium dynamics of a perturbed Ising spin model, coupled with an adaptive strategy to enlarge its sensing interval. We validate the proposed scheme on a superconducting quantum processor and demonstrate that our scheme achieves a Heisenberg scaling with respect to the encoding duration. Additionally, the adaptive strategy tunes the model to operate near its critical point with limited prior information about the parameter, enabling what is known as global sensing. Our work showcases the metrological applications empowered by non-equilibrium critical dynamics and hence opens up a pathway for devising critical quantum sensors. © 2025, CC BY.

关键词： Dynamics

Rhythmic soliton interactions for integrated dual-microcomb spectroscopy

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arXiv 2024年

作者： Wang, Zihao Wang, Yifei Shi, Baoqi Shen, Chen Sun, Wei Ding, Yulei Yang, Changxi Liu, Junqiu Bao, Chengying State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing100084 China International Quantum Academy Shenzhen518048 China Department of Optics and Optical Engineering University of Science and Technology of China Anhui Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China

Rotation symmetry of microresonators supports the generation of phase-locked counterpropagating (CP) solitons that can potentially miniaturize dual-comb systems. Realization of these dual-comb compatible solitons in photonic integrated circuits remains a challenge. Here, we synthesized such CP solitons in an integrated silicon nitride microresonator and observed forced soliton oscillation due to rhythmic, time-varying soliton interactions. The interactions result in seconds mutual-coherence passively. Temporal motion in the soliton streams is discerned by measuring a quadratic-scaling frequency noise peaks and an inverse quadratic-scaling microcomb sidebands. By generating a CP soliton trimer to have two synchronized solitons in one of the orbiting directions, we resolve the incapability of measuring two unsynchronized CP soliton dimer pulses by optical cross-correlation, and show CP solitons undergo complex motion trajectory. We further prove that precise dual-comb spectroscopy with an acquisition time as short as 0.6 µs is feasible using these solitons, although the temporal motion limits the dynamic range. Besides revealing soliton interactions with different group velocities, our work propels the realization of photonic integrated dual-comb spectrometers with high passive coherence. © 2024, CC BY.

关键词： Solitons

A microcomb-empowered Fourier domain mode-locked LiDAR

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arXiv 2024年

作者： Cai, Zhaoyu Wang, Zihao Wei, Ziqi Shi, Baoqi Sun, Wei Yang, Changxi Liu, Junqiu Bao, Chengying State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing100084 China International Quantum Academy Shenzhen518048 China Department of Optics and Optical Engineering University of Science and Technology of China Anhui Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China

Light detection and ranging (LiDAR) has emerged as an indispensable tool in autonomous technology. Among its various techniques, frequency modulated continuous wave (FMCW) LiDAR stands out due to its capability to operate with ultralow return power, immunity to unwanted light, and simultaneous acquisition of distance and velocity. However, achieving a rapid update rate with sub-micron precision remains a challenge for FMCW LiDARs. Here, we present such a LiDAR with a sub-10 nm precision and a 24.6 kHz update rate by combining a broadband Fourier domain mode-locked (FDML) laser with a silicon nitride soliton microcomb. An ultrahigh frequency chirp rate up to 320 PHz/s is linearized by a 50 GHz microcomb to reach this performance. Our theoretical analysis also contributes to resolving the challenge of FMCW velocity measurements with nonlinear frequency sweeps and enables us to realize velocity measurement with an uncertainty below 0.4 mm/s. Our work shows how nanophotonic microcombs can unlock the potential of ultrafast frequency sweeping lasers for applications including LiDAR, optical coherence tomography and sensing. © 2024, CC BY.

关键词： Silicon nitride