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Single-photon source with sub-MHz linewidth for cesium-based quantum information processing

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Frontiers of physics 2023年第6期18卷 275-281页

作者： Hai He peng-fei yang peng-fei Zhang Gang Li Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Collaborative Innovation Center of Extreme OpticsInstitute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China

A single-photon source with narrow bandwidth,high purity,and large brightness can efficiently interact with material qubits strongly coupled to an optical microcavity for quantum information ***,we experimentally demonstrate a degenerate doubly resonant single-photon source at 852 nm by the cavity-enhanced spontaneous parametric downconversion process with a 100%duty cycle of *** single photon source possesses both high purity with a second-order correlation g^((2))_(h)(0)=0.021 and narrow linewidth with△_(V_(sp))=(800±13)*** single-photon s Single-photon source with sub-MHz linewidth for cesium-based quantum information processingource is compatible with the cesium atom D2 line and can be used for cesium-based quantum information processing Single-photon source with sub-MHz linewidth for cesium-based quantum information processing0.021.

关键词： single-photon source sub-MHz linewidth few longitudinal modes quantum information processing

Selective derivatization of oxime-blocked tolylene-2,4-diisocyanate

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Chinese Chemical Letters 2013年第11期24卷 1019-1022页

作者： yang Sang peng-fei yang Tian-Duo Li Shandong Provincial Key Laboratory of Fine Chemicals Shandong Polytechnic University

A selective reaction of cyclohexanone oxime-blocked tolylene-2,4-diisocyanate（2,4-TDI）with amino siloxane was observed,in which amines were capable of discriminating two reactive groups in the 2,4-TDI ***,tolylene-2-tert-butyldimethylsilyloxyethyl carbamide-4-cyclohexanone oxime carbamate was synthesized and its precise structure was determined by single-crystal X-ray ***,it was found that oxime-blocked isocyanate could react selectively with the–NH2group with the–OH group unprotected in ethanolamine.

关键词： Cyclohexanone oxime Tolylene-2 4-diisocyanate Ethanolamine Selective reactions

Comparison of single-neutral-atom qubit between in bright trap and in dark trap

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Chinese Physics B 2019年第2期28卷 192-196页

作者： Ya-Li Tian Zhi-Hui Wang peng-fei yang peng-fei Zhang Gang Li Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices and Institute of Opto-ElectronicsShanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

A single neutral atom is one of the most promising candidates to encode a quantum bit(qubit). In a real experiment, a single neutral atom is always confined in a micro-sized far off-resonant optical trap(FORT). There are generally two types of traps: red-detuned trap and blue-detuned trap. We experimentally compare the qubits encoded in "clock states" of single cesium atoms confined separately in either 1064-nm red-detuned(bright) trap or 780-nm blue-detuned(dark) trap: both traps have almost the same trap depth. A longer lifetime of 117 s and a longer coherence time of about 10 ms are achieved in the dark trap. This provides a direct proof of the superiority of the dark trap over the bright trap. The measures to further improve the coherence are discussed.

关键词： single qubit laser trapping coherence time

The amount effect of catalyst on the urethane reaction of o-hydroxybenzyl alcohol

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Chinese Chemical Letters 2012年第2期23卷 241-244页

作者： peng fei yang Yan Hong Yu Shun Ping Wang Tian Duo Li Shandong Provincial Key Laboratory of Fine Chemicals Shandong Polytechnic UniversityJinan 250353China School of Business Shandong Polytechnic UniversityJinan 250353China

The urethane reaction of o-hydroxybenzyl alcohol with phenyl isocyanate was monitored with in situ *** dilaurate was used as catalyst and its amount effect was *** was found that there was an obvious induction period before reaction *** was interesting that the time of induction period climbed up and then declined with the increase of dibutyltin dilaurate. When the concentration of dibutyltin dilaurate reached 9.58×10^（-5） mol/L,the induction period disappeared completely and hereafter did not appear any ***,the urethane reaction kinetics was *** the concentration of dibutyltin dilaurate increased,the reaction rate of phenolic group（k_1） increased sharply,but the reaction rate of alcoholic group（k_2） appeared of little change on the whole.k_1 increased about 20-fold,yet k_2 increased about 2-fold when the concentration of dibutyltin dilaurate varied from 9.58×10^（-6） mol/L to 1.92×10~4 mol/L,which made the value of k_1/k_2 enlarge.

关键词： Urethane reaction FT-IR Dibutyltin dilaurate Polymerization

Cavity enhanced measurement of trap frequency in an optical dipole trap

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Chinese Physics B 2019年第4期28卷 165-169页

作者： peng-fei yang Hai He Zhi-Hui Wang Xing Han Gang Li peng-fei Zhang Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

We demonstrate a direct, fluorescence-free measurement of the oscillation frequency of cold atoms in an optical dipole trap based on a high-finesse optical cavity strongly coupled to atoms. The parametric heating spectra of the trapped atoms are obtained by recording the transmitted photons from the cavity with the trap depth is modulated by different ***, in our method the oscillation can be observed directly in the time scale. Being compared to the conventional fluorescence-dependent method, our approach avoids uncertainties associated with the illuminating light and auxiliary imaging optics. This method has the potential application of determining the motion of atoms with stored quantum bits or degenerate gases without destroying them.

关键词： cavity QED oscillation frequency

~1H NMR analysis of the tolylene-2,4-diisocyanate-methanol reaction

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Chinese Chemical Letters 2010年第7期21卷 853-855页

作者： peng fei yang Yong De Han Tian Duo Li Jun Ying Li Key Laboratory of Fine Chemicals(Shandong Province) Shandong Institute of Light IndustryJinan 250353China Science and Technology Office Shandong Institute of Light IndustryJinan 250353China School of Chemical Engineering Shandong Institute of Light IndustryJinan 250353China

Tolylene-2,4-diisocyanate（2,4-TDI） 1 reacts with methanol through two simultaneous paths in the polyurethane reaction,which involve two different intermediates-tolylene-4-carbamatic-2-isocyanate 2 and tolylene-2-carbamatic-4-isocyanate 3,and the final product is tolylene-2,4-dicarbamate ***-CH_3 chemical shifts in benzene ring in compounds 1,2,3 and 4 can be easily tested and well distinguished,through which those four compounds are quantified and their kinetics are *** shows that four rate constants for the tolylene-2,4-diisocyanate-methanol reaction in CCl_4 at 50℃are k_1=9.6×10^（-2）h^（-2）mol^（-2）min^（-1）, k_2=1.4×10^（-2）h^（-2）mol^（-2）min^（-1）,k_3=4.0×10^（-3）h^（-2）mol^（-2）min^（-1）,k_4=1.4×10^（-3）h^（-2）mol^（-2）min^（-1）.（k_1 is the reaction rate constant from compounds 1 to 2;k_2 is the reaction rate constant from compounds 1 to 3;k_3 is the reaction rate constant from compounds 3 to 4;k_4 is the reaction rate constant from compounds 2 to 4）.

关键词： Tolylene-2 4-diisocyanate Polyurethane reaction Kinetics

Oscillation and Migration of Bubbles within Ultrasonic Field

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Chinese Physics Letters 2019年第8期36卷 65-68页

作者： Wen-Hua Wu peng-fei yang Wei Zhai Bing-Bo Wei Department of Applied Physics Northwestern Polytechnical University

The oscillation and migration of bubbles within an intensive ultrasonic field are important issues concerning acoustic cavitation in *** establish a selection map of bubble oscillation mode related to initial bubble radius and driving sound pressure under 20 kHz ultrasound and analyze the individual-bubble migration induced by the combined effects of pressure gradient and acoustic *** results indicate that the pressure threshold of stable and transient cavitation decreases with the increasing initial bubble *** the pressure antinode,the Bjerknes force dominates the bubble migration, resulting in the large bubbles gathering toward antinode center,whereas small bubbles escape from *** contrast,at the pressure node,the bubble migration is primarily controlled by acoustic streaming,which effectively weakens the bubble adhesion on the container walls,thereby enhancing the cavitation effect in the whole liquid.

关键词： Oscillation Migration Ultrasonic Field

Synthesis and characterization of asymmetric substituted dicarbamates

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Chinese Chemical Letters 2011年第10期22卷 1167-1170页

作者： Chao Zhao peng fei yang Shun Ping Wang Jun Ying Li Tian Duo Li Shandong Provincial Key Laboratory of Fine Chemicals Shandong Polytechnic University Jinan 250353 China

Several new asymmetric substituted dicarbamates were synthesized with a convenient ***,tolylene-2,4-diisocyanate dimmer was obtained from monomer with tributylphosphine as ***,the dimmer reacted with alcohol（R^1OH） to prepare carbamate substituted ***,uretidione ring was opened and the released isocyanate reacted with another alcohol （R^2OH,R^1≠R^2）.

关键词： Asymmetric substituted dicarbamates Tolylene-2 4-diisocyanate Uretidione

Critical roles of control engineering in the development of intelligent and connected vehicles

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Journal of Intelligent and Connected Vehicles

Journal of Intelligent and Connected Vehicles 2024年第2期7卷 79-85页

作者： yang fei peng Shi yang Liu Liang Wang School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China School of Electrical and Mechanical Engineering The University of AdelaideAdelaide SA 5005Australia Research and Innovation Centre Obuda UniversityBudapest 1034Hungary Department of Architecture and Civil Engineering Chalmers University of TechnologyGothenburg SE-41296Sweden

1 Introduction In recent years,advancements in onboard computing hardware and wireless communication technology have remarkably stimulated the development of intelligent and connected vehicles(ICVs).Specifically,some researchers have investigated the issue of employing various advanced control techniques to optimize the performance of autonomous vehicles in practice(Sun et al.,2023;Zhang et al.,2023a,2023b).Therefore,this article aims to discuss why and how control engineering plays an essential role in the development of ICVs.

关键词： connected hardware intelligent