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Characterization of a microsecond pulsed non-equilibrium atmospheric pressure Ar plasma using laser scattering and optical emission spectroscopy

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Plasma science and technology 2020年第6期22卷 120-127页

作者： Fengdong JIA Yong WU Qi MIN Maogen SU Keigo TAKEDA Kenji ISHIKAWA Hiroki KONDO Makoto SEKINE Masaru HORI Zhiping ZHONG School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049People's Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100088People's Republic of China Key Laboratory of Atomic and Molecular Physics&Functional Material of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070People's Republic of China Department of Electrical and Electronic Engineering Faculty of Science and TechnologyMeijo UniversityNagoya 468-8502Japan Graduate School of Engineering Nagoya UniversityNagoya 464-8603Japan CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190People's Republic of China

A non-equilibrium atmospheric pressure argon(Ar)plasma excited by microsecond pulse is studied experimentally by laser scattering and optical emission spectroscopy(OES),and theoretically by collisional-radiative(CR)*** specifically,the electron temperature and electron density of plasma are obtained directly by the laser Thomson scattering,the gas temperature is measured by laser Raman scattering,the optical emissions of excited Ar states of plasma are measured by *** laser scattering results show that the electron temperature is about 1 eV which is similar to that excited by 60 Hz AC power,but the gas temperature is as low as 300 K compared to about 700 K excited by 60 Hz AC *** is shown that the microsecond pulsed power supply,rather than nanosecond ones,is short enough to reduce the gas temperature of atmospheric pressure plasma to near room *** electron temperature and electron density are also obtained by CR model based on OES,and find that the intensities of the optical emission intensity lines of 727.41,811.73,841.08,842.83,852.44 and 912.86 nm of Ar can be used to characterize the behavior of electron density and electron temperature,it is very useful to quickly estimate the activity of the atmospheric pressure Ar plasma in many applications.

关键词： plasma diagnosis laser Thomson scattering atmospheric pressure plasma

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Completely positive trace-preserving maps for higher-order unraveling of Lindblad master equations

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Physical Review A 2024年第6期110卷 062207-062207页

作者： Nattaphong Wonglakhon Howard M. Wiseman Areeya Chantasri Centre for Quantum Computation and Communication Technology (Australian Research Council) Centre for Quantum Dynamics Griffith University Yuggera Country Brisbane Queensland 4111 Australia Optical and Quantum Physics Laboratory Department of Physics Faculty of Science Mahidol University Bangkok 10400 Thailand

Theoretical tools used in processing continuous measurement records from real experiments to obtain quantum trajectories can easily lead to numerical errors due to a noninfinitesimal time resolution. In this work we propose a systematic assessment of the accuracy of a map. We perform error analyses for diffusive quantum trajectories, based on single-time-step Kraus operators proposed in the literature, and find the orders in time increments Δt, to which such operators satisfy the conditions for valid average quantum evolution (completely positive, convex linear, and trace preserving), and the orders to which they match the Lindblad solutions. Given these error analyses, we propose a Kraus operator that satisfies the valid average quantum evolution conditions and agrees with the Lindblad master equation, to second order in Δt, thus surpassing all other existing approaches. In order to test how well our proposed operator reproduces exact quantum trajectories, we analyze two examples of qubit measurement, where exact maps can be derived: a qubit subjected to a dispersive (z-basis) measurement and a fluorescence (dissipative) measurement. We show analytically that our proposed operator gives the smallest average trace distance to the exact quantum trajectories compared to existing approaches.

关键词： Qubits

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Strong decays of the isovector-scalar D*D¯* hadronic molecule

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Physical Review D 2024年第5期110卷 054014页

作者： Jin-Cheng Deng Bo Wang College of Physics Science and Technology Hebei Key Laboratory of High-precision Computation and Application of Quantum Field Theory Baoding 071002 China Hebei Research Center of the Basic Discipline for Computational Physics Baoding 071002 China

We adopt the effective Lagrangian approach to study the strong decays of the 1−(0++)D*D¯* molecular state [denoted as Tψ0a(4010) according to the LHCb naming convention] through triangle diagrams. The decay channels include the open-charm DD¯, and the hidden-charm ηcπ, J/ψρ, and χc1π. The coupling between the Tψ0a(4010) and its constituents D*D¯* is obtained by solving for the residue of the scattering T-matrix at the pole. Our calculations yield a total width of few tens MeV for the Tψ0a(4010) state using three different form factors, with its main decay channels being ηcπ and χc1π. The X(4100) and X(4050) have similar masses and widths, with both masses being close to the D*D¯* threshold. Additionally, their decay final states are consistent with those of the Tψ0a(4010). Therefore, it is likely that they represent the same state and both potentially correspond to the Tψ0a(4010). We suggest that future experiments focus on searching for the Tψ0a(4010) signal in the final states ηcπ−, χc1π−, and D0D− of the B0→ηcπ−K+, χc1π−K+, and D0D−K+ processes, respectively, as well as further investigating its resonance parameters with Flatté-like formula.

关键词： Hadron-hadron interactions Hadronic decays Multiquark bound states

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N to Δ transition form factors with NF = 2+1 domain wall fermions 27

N to Δ transition form factors with NF = 2+1 domain wall fe...

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27th International Symposium on Lattice Field Theory, LAT 2009

作者： Alexandrou, C. Koutsou, G. Negele, J.W. Cais, A. Proestos, Y. Tsapalis, A. Department of Physics University of Cyprus NicosiaCY-1678 Cyprus Computation-based Science and Technology Research Center Cyprus Institute 15 Kypranoros Str. Nicosia1645 Cyprus Forschungszentrum Juelich JuelichD-52425 Germany University of Wuppertal Department of Physics Wuppertal42119 Germany Center for Theoretical Physics Laboratory for Nuclear Science and Department of Physics Massachusetts Institute of Technology CambridgeMA02139 United States Hellenic Naval Academy Hatzikyriakou Ave. Pireaus18539 Greece Institute of Accelerating Systems and Applications University of Athens Athens Greece

The electromagnetic, axial and pseudoscalar nucleon to -form factors are calculated using dynamical domain wall fermions at a lattice spacing of a = 0.114 fm on a lattice of spatial size 2.74 fm and pion mass of 331 MeV. Pion pole dominance and the Goldberger-Treiman relations are examined. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

关键词： Domain walls

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Optical and Zeeman spectroscopy of individual Er ion pairs in silicon

arXiv

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arXiv 2021年

作者： Hu, Guangchong Ahlefeldt, Rose L. de Boo, Gabriele G. Lyasota, Alexey Johnson, Brett C. McCallum, Jeffrey C. Sellars, Matthew J. Yin, Chunming Rogge, Sven Centre for Quantum Computation and Communication Technology School of Physics University of New South Wales Australia Centre for Quantum Computation and Communication Technology The Australian National University Australia Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales Australia Centre for Quantum Computation and Communication Technology RMIT University Australia Centre for Quantum Computation and Communication Technology The University of Melbourne Australia Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Microscale Magnetic Resonance School of Physical Sciences University of Science and Technology of China China

We make the first study the optical energy level structure and interactions of pairs of single rare earth ions using a hybrid electro-optical detection method applied to Er-implanted silicon. Two examples of Er3+ pairs were identified in the optical spectrum by their characteristic energy level splitting patterns, and linear Zeeman spectra were used to characterise the sites. One pair is positively identified as two identical Er3+ ions in sites of at least C2 symmetry coupled via a large, 200 GHz Ising-like spin interaction and 1.5 GHz resonant optical interaction. Small non-Ising contributions to the spin interaction are attributed to distortion of the site measurable because of the high resolution of the single-ion measurement. The interactions are compared to previous measurements made using rare earth ensemble systems, and the application of this type of strongly coupled ion array to quantum computing is discussed. © 2021, CC BY.

关键词： Silicon

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Experimental Demonstration of Input-Output Indefiniteness in a Single Quantum Device

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Physical Review Letters 2024年第16期132卷 160201-160201页

作者： Yu Guo Zixuan Liu Hao Tang Xiao-Min Hu Bi-Heng Liu Yun-Feng Huang Chuan-Feng Li Guang-Can Guo Giulio Chiribella CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Hefei National Laboratory University of Science and Technology of China Hefei 230088 China QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong HKU-Oxford Joint Laboratory for Quantum Information and Computation Department of Computer Science University of Oxford Wolfson Building Parks Road Oxford United Kingdom Perimeter Institute for Theoretical Physics 31 Caroline Street North Waterloo Ontario Canada

Quantum theory allows information to flow through a single device in a coherent superposition of two opposite directions, resulting into situations where the input-output direction is indefinite. Here we introduce a theoretical method to witness input-output indefiniteness in a single quantum device, and we experimentally demonstrate it by constructing a photonic setup that exhibits input-output indefiniteness with a statistical significance exceeding 69 standard deviations. Our results provide a way to characterize input-output indefiniteness as a resource for quantum information and photonic quantum technologies and enable tabletop simulations of hypothetical scenarios exhibiting quantum indefiniteness in the direction of time.

关键词： Quantum correlations, foundations & formalism Quantum formalism Quantum foundations

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Virtual monopoles in a bosonic atom-diatomic-molecule system

Virtual monopoles in a bosonic atom-diatomic-molecule system

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第十八届全国原子与分子物理学术会议

作者： Sheng-Chang Li Li-Bin Fu Jie Liu School of Science Xi'an Jiaotong UniversityXi'an 710049China Center for Applied Physics and Technology Peking UniversityBeijing 100084China National Key Laboratory of Science and Technology on Computation Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China

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Atomically dispersed lr/α-MoC catalyst with high metal loading and thermal stability for water-promoted hydrogenation reaction

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National science Review 2022年第1期 118-127页

作者： Siwei Li Ruochen Cao Mingquan Xu Yuchen Deng Lili Lin Siyu Yao Xuan Liang Mi Peng Zirui Gao Yuzhen Ge Jin-Xun Liu Wei-Xue Li Wu Zhou Ding Ma Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering and College of Engineering and BIC-ESAT Peking University School of Chemistry and Materials Science CAS Excellence Center for Nanoscience Hefei National Laboratory for Physical Sciences at the Microscale iChEM University of Science and Technology of China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences School of Physical Sciences and CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences

Synthesis of atomically dispersed catalysts with high metal loading and thermal stability is challenging but particularly valuable for industrial application in heterogeneous ***,we report a facile synthesis of a thermally stable atomically dispersed Ir/α-MoC catalyst with metal loading as high as 4 wt%,an unusually high value for carbide supported metal *** strong interaction between Ir and theα-MoC substrate enables high dispersion of Ir on the α-MoC surface,and modulates the electronic structure of the supported Ir *** quinoline hydrogenation as a model reaction,we demonstrate that this atomically dispersed Ir/α-MoC catalyst exhibits remarkable reactivity,selectivity and stability,for which the presence of high-density isolated Ir atoms is the key to achieving high metal-normalized activity and mass-specific *** also show that the water-promoted quinoline hydrogenation mechanism is preferred over the Ir/α-MoC,and contributes to high sele ctivity towards 1,2,3,*** present work demonstrates a new strategy in constructing a high-loading atomically dispersed catalyst for the hydrogenation reaction.

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Leptonic di-flavor and di-number violation processes at high energyμ^(±)μ^(±)colliders

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Chinese physics C 2024年第4期48卷 34-50页

作者：杨金磊张肇西冯太傅 CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Department of Physics Hebei UniversityKey Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei ProvinceBaoding 071002China

The leptonic di-flavor violation (LFV) processes μ^(±)μ^(±)→e^(±)e^(±) and μ^(±)μ^(±)→τ^(±)τ^(±) and leptonic di-number violation (LNV) processes μ^(±)μ^(±)... 详细信息

The leptonic di-flavor violation (LFV) processes μ^(±)μ^(±)→e^(±)e^(±) and μ^(±)μ^(±)→τ^(±)τ^(±) and leptonic di-number violation (LNV) processes μ^(±)μ^(±)→W_(i)^(±)W_(j)^(±) (i,j=1,2) at same-sign high energy μ^(±)μ^(±) colliders are studied. The new physics (NP) factors that may play roles in these processes are highlighted by cataloging them into three types. Taking into account the experimental constraints, the processes at μ^(±)μ^(±) colliders are computed, and the results are presented properly. The results lead to the conclusion that observing the NP factors through the LFV and LNV processes at TeV-energy μ^(±)μ^(±) colliders has significant advantages that cannot be achieved elsewhere. Therefore, once the techniques for muon acceleration and collision are developed successfully, the option of building same-sign high energy muon colliders should be seriously considered.

关键词： μ^(±)μ^(±)collider neutral lepton Majorana components

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Calculation of the decay width of decuplet baryons 33

Calculation of the decay width of decuplet baryons

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33rd International Symposium on Lattice Field Theory, LATTICE 2015

作者： Alexandrou, Constantia Petschlies, Marcus Negele, John W. Pochinsky, Andrew V. Syritsyn, Sergey S. Computation-based Science and Technology Research Center Cyprus Institute 20 Kavafi Str. Nicosia2121 Cyprus Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Helmholtz-Institut Fur Strahlen- und Kernphysik Rheinische Friedrich-Wilhelms-Universität Bonn Nußallee 14-16 BonnD-53115 Germany Laboratory for Nuclear Science and Department of Physics Center for Theoretical Physics Massachusetts Institute of Technology CambridgeMA02139 United States RIKEN BNL Research Center Brookhaven National Laboratory UptonNY11973 United States

We calculate the coupling constant and decay width of the decuplet to octet baryon transitions in lattice QCD using the transfer matrix method. The transition amplitude is related to the coupling constant and via the Fermi's Golden Rule to the decay width. The method is applicable for near-degeneracy of the energy levels of initial and final states and, when this condition is fulfilled, yields a good estimate of the decay width. We present results using a hybrid action with domain wall valence quarks on a staggered sea with 350MeV pION mass as well as for a domain wall fermion action with 180MeV pION mass. We find (Δ-πN) = 119(8) (8)MeV for the transition of Delta to pion-nucleon within the unitary domain wall setup. We also report values for the decay widths of the ∑ and X baryons.

关键词： Transfer matrix method

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