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Effects of quantum interference in multiwaveguide systems bridged by Jaynes-Cummings emitters

Physical Review A 2022年第5期105卷 053712-053712页

作者： Zhen-Rui Li Junhua Dong Yafang Xu Bingsuo Zou Yongyou Zhang Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China College of Physics Science and Technology Yangzhou University Yangzhou 225002 China MOE and Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials School of Physical Science and Technology Guangxi University Nanning 530004 China

Quantum interference, responsible for a number of resonant optical phenomena, always intrigues researchers because of its application in optical devices. This work studies it in multiwaveguide systems bridged by Jaynes-Cummings emitters (JCEs) based on the scattering matrix theory. Two types of quantum interference are distinguished here. The first is between the incident wave and those scattered from the JCEs, while the second is only among those scattered waves. The first type leads to the two transmission valleys at the two eigenfrequencies of the JCEs in single-waveguide–single-JCE coupled systems. However, the second type is responsible for the narrow transmission peaks in single-waveguide–multi-JCE coupled systems, locating in the above transmission valleys. This work first shows the properties of the second type of quantum interference in detail and then discusses its two applications. On the one hand, the second type of quantum interference can be used to tailor the transmission spectra to achieve the electromagnetically-induced-transparency-like line shapes with a large group delay. On the other hand, it can also lead to the single-photon jumping between two certain waveguides with a nearly 100% chance in multiwaveguide systems by switching on or off some of the couplings of the JCEs to the waveguides. These applications with small peak widths commonly require a small loss and might have potential in quantum informatics.

关键词： Coherent control Quantum interference effects Scattering theory Waveguide arrays

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A Six-Core Microstructured Fiber for Sensing Applications

A Six-Core Microstructured Fiber for Sensing Applications

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3D Image Acquisition and Display: technology, Perception and Applications, 3D 2024 - Part of Optica Imaging Congress

作者： Agarwal, Akshat Mittal, Shweta Punia, Sushma Saharia, Ankur Bourdine, Anton V. Morozov, Oleg G. Meshkov, Ivan K. Ismail, Yaseera Singh, Ghanshyam Tiwari, Manish Opto. and Photonics Research Lab ECE Department Manipal University Jaipur Jaipur303007 India Department of Communication Lines PSUTI Samara443010 Russia Department of Radiophot. and Microwave Tech. Kazan National Research Technical University Kazan420111 Russia Department of Telecommunication Systems Ufa University of Science and Technology Ufa450000 Russia Department of Physics Stellenbosch University Stellenbosch7600 South Africa Department of ECE Malaviya National Institute of Technology Jaipur Jaipur302017 India

A surface plasmon resonance biosensor design is presented, comprising of gold - coated six-core microstructured fiber. The designed sensor exhibits phase matching characteristics for a wider refractive index range of ... 详细信息

ISBN: (纸本)9781957171364

关键词： Surface plasmon resonance

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PACKETLSTM: DYNAMIC LSTM FRAMEWORK FOR STREAMING DATA WITH VARYING FEATURE SPACE

arXiv

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arXiv 2024年

作者： Agarwal, Rohit Naidu, Karaka Prasanth Horsch, Alexander Agarwal, Krishna Prasad, Dilip K. Bio-AI Lab Department of Computer Science UiT The Arctic University of Norway Tromsø Norway Dhanbad India Department of Physics and Technology UiT The Arctic University of Norway Tromsø Norway

We study the online learning problem characterized by the varying input feature space of streaming data. Although LSTMs have been employed to effectively capture the temporal nature of streaming data, they cannot handle the dimension-varying streams in an online learning setting. Therefore, we propose a dynamic LSTM-based novel method, called packetLSTM, to model the dimension-varying streams. The packetLSTM’s dynamic framework consists of an evolving packet of LSTMs, each dedicated to processing one input feature. Each LSTM retains the local information of its corresponding feature, while a shared common memory consolidates global information. This configuration facilitates continuous learning and mitigates the issue of forgetting, even when certain features are absent for extended time periods. The idea of utilizing one LSTM per feature coupled with a dimension-invariant operator for information aggregation enhances the dynamic nature of packetLSTM. This dynamic nature is evidenced by the model’s ability to activate, deactivate, and add new LSTMs as required, thus seamlessly accommodating varying input dimensions. The packetLSTM achieves state-of-the-art results on five datasets, and its underlying principle is extended to other RNN types, like GRU and vanilla RNN. Copyright © 2024, The Authors. All rights reserved.

关键词： Data streams

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Fabry-Perot Cavity Assembled on Terfenol-D Slab for High-Resolution Magnetic Field Measurement

Fabry-Perot Cavity Assembled on Terfenol-D Slab for High-Res...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Yucheng Yao Zhiyong Zhao Jun-bo Han Jing Liu Shuyan Chen Zhuyixiao Liu Ming Tang Wuhan National Lab for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Wuhan National High Magnetic Field Center and Department of Physics Huazhong University of Science and Technology Wuhan China

By utilizing a microwave photonics-interrogated Fabry-Perot interferometer fabricated on a Terfenol-D slab, an ultra-high resolution magnetic field sensor is achieved with a maximum sensitivity of 4.6 MHz/mT, and a re... 详细信息

ISBN: (纸本)9798350369311

关键词： Microwave measurement Laser theory Magnetic field measurement Sensitivity Magnetic sensors Measurement by laser beam Magnetic fields Slabs Microwave photonics Fabry-Perot interferometers

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Biosynthesis of Flower-Shaped CuO Nanostructures and Their Photocatalytic and Antibacterial Activities

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Nano-Micro Letters 2020年第2期12卷 224-234页

作者： Hafsa Siddiqui MSQureshi Fozia Zia Haque Department of Physics Sha-Shib College of Science and ManagementBhopal 462030India Optical Nanomaterial Lab Department of PhysicsMaulana Azad National Institute of TechnologyBhopal 462003India

Copper oxide nanoflowers(CuO-NFs)have been synthesized through a novel green route using Tulsi leaves-extracted eugenol(4-allyl-2-methoxyphenol)as reducing *** results reveal the growth of crystalline singlephase CuO-NFs with monoclinic *** prepared CuO-NFs can effectively degrade methylene blue with 90%*** also show strong barrier against ***(27±2 mm)at the concentration of 100μg mL−1,while at the concentration of 25μg mL−1 weak barrier has been found against all examined bacterial *** results provide important evidence that CuO-NFs have sustainable performance in methylene blue degradation as well as bacterial organisms.

关键词： Copper oxide O.Sanctum Eugenol Biosynthesis Photocatalysis Antibacterial

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Actuation system for inertial sensors in high-precision space missions using a torsion pendulum

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Physical Review D 2024年第10期110卷 102005-102005页

作者： Fangchao Yang Yan Zhu Xiaofei Jin Yujie Zhao Wei Hong Shixun Pei Zhejiang Lab Hangzhou 311121 People’s Republic of China MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan 430074 People’s Republic of China

Precision space inertial sensors are imperative for Earth geodesy missions, gravitational wave observations, and fundamental physics experiments in space. In these missions, the residual acceleration noise of a test mass (TM) caused by the forces generated from inertial sensor components and the environment must be maintained below a specific level. Several forces contributing to residual acceleration are related to the actuation system. Hence, developing a precise actuation system is crucial to eliminate erroneous forces and achieve highly accurate measurements of TM acceleration noise. However, obtaining a “free-fall” status of the TM to perform sensitive ground tests for the actuation system poses significant challenges. In this study, a torsion pendulum was employed to analyze the impact of the actuation system on TM torque noise. A closed-loop control system integrating the torsion pendulum with components of the actuation modules was designed to assess the performance of the actuation control algorithm. Experimental findings indicate that certain parameters, such as the maximum torques and DC bias voltages in an actuation system, contribute to additional torque noise, with the peak noise level reaching up to 10−13 Nm/Hz1/2 at 1 mHz. The closed-loop system demonstrates a stable tracking error of approximately 10−7, indicating the robust tracking performance and robustness of the integrated system for TM rotation control in varying inertial sensor conditions. The proposed method serves as a reference for advancing actuation systems in diverse space gravitational missions.

关键词： Gravitational wave detection

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Dissipation induced transition between delocalization and localization in the three-dimensional Anderson model

arXiv

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arXiv 2024年

作者： Yang, Xuanpu Jiang, Xiang-Ping Wei, Zijun Wang, Yucheng Pan, Lei School of Physics Nankai University Tianjin300071 China Zhejiang Lab Hangzhou311121 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China International Quantum Academy Shenzhen518048 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China

We investigate the probable delocalization-localization transition in open quantum systems with disorder. The disorder can induce localization in isolated quantum systems and it is generally recognized that localization is fragile under the action of dissipations from the external environment due to its interfering nature. Recent work [Y. Liu, et al, Phys. Rev. Lett. 132, 216301 (2024)] found that a one-dimensional quasiperiodic system can be driven into the localization phase by a tailored local dissipation where a dissipation-induced delocalized-localized transition is proposed. Based on this, we consider a more realistic system and show that a dissipation-induced transition between delocalization and localization appears in the three-dimensional (3D) Anderson model. By tuning local dissipative operators acting on nearest neighboring sites, we find that the system can relax to localized states dominated steady state instead of the choice of initial conditions and dissipation strengths. Moreover, we can also realize a delocalized states predominated steady-state from a localized initial state by using a kind of dissipation operators acting on next nearest neighboring sites. Our results enrich the applicability of dissipation-induced localization and identify the transition between delocalized and localized phases in 3D disordered systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum optics

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Quasi-One-Dimensional Spin Transport in Altermagnetic Z3 Nodal Net Metals

arXiv

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arXiv 2024年

作者： He, Tingli Li, Lei Cui, Chaoxi Zhang, Run-Wu Yu, Zhi-Ming Liu, Guodong Zhang, Xiaoming State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and Engineering Hebei University of Technology Tianjin300401 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China

In three dimensions, quasi-one-dimensional (Q1D) transport has traditionally been associated with systems featuring a Q1D chain structure. Here, based on first-principle calculations, we go beyond this understanding to show that the Q1D transport can also be realized in certain three-dimensional (3D) altermagnetic (AM) metals with a topological nodal net in momentum space but lacking Q1D chain structure in real space, including the existing compounds β-Fe2(PO4)O, Co2(PO4)O, and LiTi2O4. These materials exhibit an AM ground state and feature an ideal crossed Z3 Weyl nodal line in each spin channel around Fermi level, formed by three straight and flat nodal lines traversing the entire Brillouin zone. These nodal lines eventually lead to an AM Z3 nodal net. Surprisingly, the electronic conductivity σxx in these topological nodal net metals is dozens of times larger than σyy and σzz in the up-spin channel, while σyy dominates transport in the down-spin channel. This suggests a distinctive Q1D transport signature in each spin channel, and the principal moving directions for the two spin channels are orthogonal, resulting in Q1D direction-dependent spin transport. This novel phenomenon cannot be found in both conventional 3D bulk materials and Q1D chain materials. In particular, the Q1D spin transport gradually disappears as the Fermi energy moves away from the nodal net, further confirming its topological origin. Our work not only enhances the comprehension of topological physics in altermagnets but also opens a new direction for the exploration of topological spintronics. Copyright © 2024, The Authors. All rights reserved.

关键词： Ground state

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2D material-based optical sensors: a review

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ISSS Journal of Micro and Smart Systems 2022年第1期11卷 169-177页

作者： Subbanna, B. Bala Choudhary, Kuldeep Singh, Sonika Kumar, Santosh Advance Research Lab Department of Electrical and Electronics and Communication Engineering DIT University Dehradun India Shandong Key Laboratory of Optical Communication Science and Technology School of Physics Science and Information Technology Liaocheng University Liaocheng China

The purpose of this review article is to highlight the advanced applications of two-dimensional (2D) materials, with their significance in the development of optical sensors (OSs), with sensing substances, sensing mechanisms, and new sensing mechanism recommendations. Recently, 2D materials have gained considerable interest due to their promise of superior electronic properties, attractive quantum physics, and high photo-response. Numerous studies have been conducted on the exceptional physical/chemical properties and applications of 2D materials. Transition metal dichalcogenides (TMDs) play a critical role in the next generation of sensing applications due to their low toxicity, inherent layered van der Waals structure, and unmistakable structure that may be designed. A combination of structural, electrical, and optical properties of 2D TMDs is used to fabricate high-performance optical sensors.

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Single-lane 200 Gbit/s photonic wireless transmission of multicarrier 64-QAM signals at 300 GHz over 30 m

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Chinese Optics Letters 2023年第2期21卷 138-142页

作者：张红旗张鹿杨作民杨航吕治东庞晓丹 Oskars Ozolins 余显斌 Zhejiang Lab Hangzhou 311121China College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Applied Physics Department KTH Royal Institute of Technology10691 StockholmSweden Networks Unit RISE Research Institutes of Sweden16440 KistaSweden

Recently,wireless communication capacity has been witnessing unprecedented *** from the optoelectronic components with large bandwidth,photonics-assisted terahertz(THz)communication links have been extensively developed to accommodate the upcoming wireless transmission with a high data ***,limited by the available signalto-noise ratio and THz component bandwidth,single-lane transmission of beyond 100 Gbit/s data rate using a single pair of THz transceivers is still very *** this study,a multicarrier THz photonic wireless communication link in the 300 GHz band is proposed and experimentally *** by subcarrier multiplexing,spectrally efficient modulation format,well-tailored digital signal processing routine,and broadband THz transceivers,a line rate of 72 Gbit/s over a wireless distance of 30 m is successfully demonstrated,resulting in a total net transmission capacity of up to 202.5 Gbit/*** single-lane transmission of beyond 200 Gbit/s overall data rate with a single pair of transceivers at 300 GHz is considered a significant step toward a viable photonics-assisted solution for the next-generation information and communication technology (ICT) infrastructure.

关键词： terahertz communication terahertz photonics wavelength division multiplexing photonic-wireless transmission

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