检索结果-南通市图书馆

Multi-window transparency and fast–slow light switching in a quadratically coupled optomechanical system assisted with three-level atoms

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第3期27卷 267-273页

作者： Wan-Ying Wei ya-fei yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices （SIPSE） Guangdong Provincial Key Laboratory of Quantum Engineering Quantum Materials South China Normal University Guangzhou 510006 China

We study theoretically the features of the output field of a quadratically coupled optomechanical system assisted with three-level atoms. In this system, the atoms interact with the cavity field and are driven by a classical field, and the cavity is driven by a strong coupling field and a weak signal field. We find that there exists a multi-window transparency phenomenon. The width of the transparent windows can be adjusted by controlling the system parameters, including the number of the atoms, the powers of the lasers driving the atoms and driving the cavity, and the environment temperature. We also find that a tunable switch from fast light to slow light can be realized in this system.

关键词： quantum optics optomechanics optomechanically induced transparency fast and slow light

Entangling two oscillating mirrors in an optomechanical system via a flying atom

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第7期27卷 357-361页

作者： yu-Bao Zhang Jun-Hao Liu ya-fei yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices（SIPSE） Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal UniversityGuangzhou 510006China

We propose a novel scheme for generating the entanglement of two oscillating mirrors in an optomechanical system via a flying atom. In this scheme, a two-level atom, in an arbitrary superposition state, passes through an optomechanical system with two oscillating cavity-mirrors, and then its states are detected. In this way, we can generate the entangled states of the two oscillating mirrors. We derive the analytical expressions of the entangled states and make numerical calculations. We find that the entanglement of the two oscillating mirrors can be controlled by the initial state of the atom, the optomechanical coupling strength, and the coupling strength between the atom and the cavity field. We investigate the dynamics of the system with dissipations and discuss the experimental feasibility.

关键词： quantum entanglement optomechanical system dissipative dynamics

Optical nonreciprocity in a piezo-optomechanical system

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第7期29卷 321-325页

作者： yu-Ming Xiao Jun-Hao Liu Qin Wu ya-fei yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices and School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Normal UniversityGuangzhou 510006China School of Biomedical Engineering Guangdong Medical UniversityDongguan 523808China

We theoretically study the optical nonreciprocity in a piezo-optomechanical microdisk resonator,in which the cavity modes and the mechanical mode are optically pumped and piezoelectrically driven,*** asymmetric optical pumping and different piezoelectrical drivings,our system shows some nonreciprocal optical *** find that our system can function as an optical isolator,a nonreciprocal amplifier,or a nonreciprocal phase shifter.

关键词： quantum optics cavity optomechanical system optical nonreciprocity piezoelectric force

Effects of the Casimir force on the properties of a hybrid optomechanical system

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第1期28卷 379-384页

作者： Yi-Ping Wang Zhu-Cheng Zhang ya-fei yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices(School of Information and Optoelectronic Science and Engineering) Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal University

We investigate the effects of the Casimir force on the output properties of a hybrid optomechanical system. In this system, a nanosphere is fixed on the movable-mirror side of the standard optomechanical system, and the nanosphere interacts with the movable-mirror via the Casimir force, which depends on the mirror–sphere separation. In the presence of the probe and control fields, we analyze the transmission coefficient and the group delay of the field-component with the frequency of the probe field. We also study the transmission intensity of the field-component with the frequency of a newly generated four-wave mixing(FWM) field. By manipulating the Casimir force, we find that a tunable slow light can be realized for the field-component with the frequency of the probe field, and the intensity spectrum of the FWM field can be enhanced and shifted effectively.

关键词： quantum optics optomechanics quantum information and processing

Negativity of Wigner function and phase sensitivity of an SU(1,1) interferometer

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第6期28卷 121-125页

作者： Chun-Li Liu Li-Li Guo Zhi-Ming Zhang ya-fei yu Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringGuangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal UniversityGuangzhou 510006China

Both the negativity of Wigner function and the phase sensitivity of an SU(1,1) interferometer are investigated in this paper. In the case that the even coherent state and squeezed vacuum state are input into the interferometer, the Heisenberg limit can be approached with parity detection. At the same time, the negativity volume of Wigner function of detection mode comes entirely from the input state and varies periodically with the encoding phase. In addition, the negativity volume of Wigner function is positively correlated with the phase sensitivity of the SU(1,1) interferometer. The positive correlation may mean that the non-classicality indicated by negative Wigner function is a kind of resource that can verify some related research results of phase estimation.

关键词： SU(1,1) interferometer Wigner function phase sensitivity

Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第9期31卷 301-306页

作者： yuan-yuan Liu Zhi-Ming Zhang Jun-Hao Liu Jin-Dong Wang ya-fei yu Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices(School of Information and Optoelectronic Science and Engineering) South China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Normal UniversityGuangzhou 510006China

We investigate the quantum entanglement in a double-cavity optomechanical system consisting of an optomechanical cavity and an auxiliary cavity,where the optomechanical cavity mode couples with the mechanical mode via radiation-pressure interaction,and simultaneously couples with the auxiliary cavity mode via nonreciprocal *** study the entanglement between the mechanical oscillator and the cavity modes when the two cavities are reciprocally or non-reciprocally *** logarithmic negativity E_(n)^((1))(E_(n)^((2)))is adopted to describe the entanglement degree between the mechanical mode and the optomechanical cavity mode(the auxiliary cavity mode).We find that both E_(n)^((1))and E_(n)^((2))have maximum values in the case of reciprocal *** using nonreciprocal coupling,E_(n)^((1))and E_(n)^((2))can exceed those maximum values,and a wider detuning region where the entanglement exists can be ***,the entanglement robustness with respect to the environment temperature is also effectively enhanced.

关键词： quantum entanglement double-cavity optomechanical system nonreciprocal coupling

Pollution source identification methods and remediation technologies of groundwater: A review

在线全文

学校读者我要写书评

暂无评论

China Geology 2024年第1期7卷 125-137页

作者： ya-ci Liu yu-hong fei ya-song Li Xi-lin Bao Peng-wei Zhang Fujian Provincial Key Laboratory of Water Cycling and Eco-Geological Processes Institute of Hydrogeology and Environmental GeologyChinese Academy of Geological SciencesXiamen 361000China Key Laboratory of Water and Soil Resources Conservation and Restoration in the Middle and Lower Reaches of Yellow River Basin MNRZhengzhou 450016China

Groundwater is an important source of drinking *** pollution severely endangers drinking water safety and sustainable social *** the case of groundwater pollution,the top priority is to identify pollution sources,and accurate information on pollution sources is the premise of efficient ***,an appropriate pollution remediation scheme should be developed according to information on pollution sources,site conditions,and economic *** methods for identifying pollution sources mainly include geophysical exploration,geochemistry,isotopic tracing,and numerical *** these identification methods,only the numerical modeling can recognize various information on pollution sources,while other methods can only identify a certain aspect of pollution *** remediation technologies of groundwater can be divided into in-situ and ex-situ remediation technologies according to the remediation *** in-situ remediation technologies enjoy low costs and a wide remediation range,but their remediation performance is prone to be affected by environmental conditions and cause secondary *** ex-situ remediation technologies boast high remediation efficiency,high processing capacity,and high treatment concentration but suffer high *** methods for pollution source identification and remediation technologies are applicable to different *** achieve the expected identification and remediation results,it is feasible to combine several methods and technologies according to the actual hydrogeological conditions of contaminated sites and the nature of ***,detailed knowledge about the hydrogeological conditions and stratigraphic structure of the contaminated site is the basis of all work regardless of the adopted identification methods or remediation technologies.

关键词： Groundwater pollution Identification of pollution sources Geophysical exploration identification Geochemistry identification Isotopic tracing Numerical modeling Remediation technology Hydrogeological conditions Hydrogeological survey engineering

Breakthrough in Li-mediated continuous electrosynthesis of ammonia

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第10期67卷 3191-3192页

作者： fei Zhan Chang yu State Key Laboratory of Chemical Resource Engineering College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringSchool of Chemical EngineeringDalian University of TechnologyDalian 116024China

Ammonia(NH3)ranks among the manufactured chemicals,with an annual production surpassing 182 million tons[1],which is an indispensable raw material for fertilizer industry and has been recognized as a promising carbon-... 详细信息

关键词： ammonia Ammonia suppl

Partial Linear Model Averaging Prediction for Longitudinal Data

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年第2期37卷 863-885页

作者： LI Na fei yu ZHANG Xinyu Faculty of Science Kunming University of Science and TechnologyKunming 650500China School of Statistics and Mathematics Yunnan University of Finance and EconomicsKunming 650221China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China

Prediction plays an important role in data *** averaging method generally provides better prediction than using any of its *** though model averaging has been extensively investigated under independent errors,few authors have considered model averaging for semiparametric models with correlated *** this paper,the authors offer an optimal model averaging method to improve the prediction in partially linear model for longitudinal *** model averaging weights are obtained by minimizing criterion,which is an unbiased estimator of the expected in-sample squared error loss plus a *** properties,including asymptotic optimality and consistency of averaging weights,are established under two scenarios:(i)All candidate models are misspecified;(ii)Correct models are available in the candidate *** studies and an empirical example show that the promise of the proposed procedure over other competitive methods.

关键词： Asymptotic optimality longitudinal data model averaging estimator partially linear model prediction