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X-ray polarimetry and its application to strong-field quantum electrodynamics

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High Power Laser Science and Engineering 2023年第6期11卷 47-70页

作者： Qiqi Yu Dirui Xu Baifei Shen Thomas E.Cowan Hans-Peter Schlenvoigt Shanghai Normal University ShanghaiChina Helmholtz-Zentrum Dresden-Rossendorf DresdenGermany State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina Technische Universität Dresden DresdenGermany

Polarimetry is a highly sensitive method to quantify changes of the polarization state of light when passing through matter and is therefore widely applied in material *** progress of synchrotron and X-ray free electron laser(XFEL)sources has led to significant developments of X-ray polarizers,opening perspectives for new applications of polarimetry to study source and beamline parameters as well as sample characteristics.X-ray polarimetry has shown to date a polarization purity of less than 1.4×10^(-11),enabling the detection of very small signals from ultrafast phenomena.A prominent application is the detection of vacuum *** birefringence is predicted in quantum electrodynamics and is expected to be probed by combining an XFEL with a petawatt-class optical *** review how source and optical elements affect X-ray polarimeters in general and which qualities are required for the detection of vacuum birefringence.

关键词： birefringence polarimetry polarizer quantum electrodynamics X-rays

Revised quantum electrodynamics in a Condensed Form

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Journal of Modern Physics 2016年第11期7卷 1316-1319页

作者： Bo Lehnert Alfvén Laboratory Royal Institute of Technology Stockholm Sweden

This theory aims beyond the possibilities being available from the Standard Model. Examples are given by the directly obtained rest masses of the elementary particles, the deduced values of the elementary charge and of the mass of the boson detected by CERN which are close to their experimental data, and by an incorporated spin of the photon.

关键词： quantum electrodynamics Zero Point Energy Standard Model and beyond

Dense positrons and γ-rays generation by lasers interacting with convex target

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Plasma Science and Technology 2021年第1期23卷 23-31页

作者： Nureli YASEN Baisong XIE Weiyuan LIU Key Laboratory of Beam Technology of the Ministry of Education and College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875People’s Republic of China Beijing Radiation Center Beijing 100875People’s Republic of China Key Laboratory for Laser Plasmas(MOE) School of Physics and AstronomyShanghai Jiaotong UniversityShanghai 200240People’s Republic of China IFSA Collaborative Innovation Center Shanghai Jiaotong UniversityShanghai 200240People’s Republic of China

We use quantum electrodynamics particle-in-cell simulation to study the generation of dense electron–positron plasma and strongγ-ray bursts in counter-propagating laser beam interactions with two different solid targets,***(type I)and convex(type II).We find that type II limits fast electron flow most *** the photon density is increased by about an order of magnitude and energy by approx.10%–20%compared with those in type I target.γ-photon source with an ultrahigh peak brilliance of 2?×?1025 photons/s/mm2/mrad2/0.1%BW is generated by nonlinear Compton scattering ***,use of type II target increases the positron density and energy by 3 times and 32%respectively,compared with those in type I *** addition,the conversion efficiencies of total laser energy toγ-rays and positrons of type II are improved by 13.2%and 9.86%compared with type *** improvements in conversion efficiency and positron density are envisaged to have practical applications in experimental field.

关键词： electron-positron pairs γ-rays particle-in-cell(PIC) nonlinear Compton scattering(NCS) multi-photon Breit-Wheeler proces quantum electrodynamics generation of dense electron-positron plasma

Atomic structure and collision dynamics with highly charged ions

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Chinese Physics B 2022年第9期31卷 13-40页

作者： Xinwen Ma Shaofeng Zhang Weiqiang Wen Zhongkui Huang Zhimin Hu Dalong Guo Junwen Gao Bennaceur Najjari Shenyue Xu Shuncheng Yan Ke Yao Ruitian Zhang Yong Gao Xiaolong Zhu Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Sichuan UniversityChengdu 610064China Department of Physics Hangzhou Normal UniversityHangzhou 311121China Shanghai EBIT Laboratory Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE)Fudan UniversityShanghai 200433China

The research progresses on the investigations of atomic structure and collision dynamics with highly charged ions based on the heavy ion storage rings and electron ion beam traps in recent 20 years are *** structure part covers test of quantum electrodynamics and electron correlation in strong Coulomb field studied through dielectronic recombi-nation spectroscopy and VUV/x-ray *** collision dynamics part includes charge exchange dynamics in ion-atom collisions mainly in Bohr velocity region,ion-induced fragmentation mechanisms of molecules,hydrogen-bound and van de Waals bound clusters,interference,and phase information observed in ion-atom/molecule *** this achievements,two aspects of theoretical studies related to low energy and relativistic energy collisions are *** applications of data relevant to key atomic processes like dielectronic recombination and charge exchanges involving highly charged ions are *** the end of this review,some future prospects of research related to highly charged ions are proposed.

关键词： highly charged ion atomic structure collision dynamics quantum electrodynamics fragmentation mechanisms relativistic effects electron correlation

Big picture of relativistic molecular quantum mechanics

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National Science Review 2016年第2期3卷 204-221页

作者： Wenjian Liu Beijing National Laboratory for Molecular Sciences Institute of Theoretical and Computational ChemistryState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular Engineeringand Center for Computational Science and EngineeringPeking University

Any quantum mechanical calculation on electronic structure ought to choose first an appropriate Hamiltonian H and then an Ansatz for parameterizing the wave function Ψ,from which the desired energy/property E(X) can finally be ***,the very first question is:what is the most accurate many-electron Hamiltonian H? It is shown that such a Hamiltonian *** quantum electrodynamics(eQED) Hamiltonian,can be obtained naturally by incorporating properly the charge conjugation symmetry when normal ordering the second quantized fermion *** this eQED Hamiltonian as the basis,various approximate relativistic many-electron Hamiltonians can be obtained based entirely on physical *** these Hamiltonians together form a complete and continuous’ Hamiltonian ladder’,from which one can pick up the right one according to the target physics and *** for the many-electron wave function Ψ,the most intriguing questions are as follows,(i) How to do relativistic explicit correlation?(ⅱ) How to handle strong correlation? Both general principles and practical strategies are outlined here to handle these *** the electronic properties E(λ) that sample the electronic wave function nearby the nuclear region,nuclear magnetic resonance(NMR)shielding and nuclear spin-rotation(NSR) coupling constant are especially challenging:they require body-fixed molecular Hamiltonians that treat both the electrons and nuclei as relativistic quantum ***,they have been formulated *** particular,a very robust ’relativistic mapping’between the two properties has been established,which can translate experimentally measured NSR coupling constants to very accurate absolute NMR shielding scales that otherwise cannot be obtained *** the most general and fundamental issues pertinent to all the three components of the quantum mechanical equation HΨ = EΨ(*** H,wave function Ψ,and energy/property E(λ)) have f

关键词： relativistic quantum mechanics quantum electrodynamics relativistic Hamiltonian electron correlation magnetic property

Ultra-thin Glass Film Coated with Graphene: A New Material for Spontaneous Emission Enhancement of quantum Emitter

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Nano-Micro Letters 2015年第3期7卷 261-267页

作者： Lu Sun Chun Jiang State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University

We propose an ultra-thin glass film coated with graphene as a new kind of surrounding material which can greatly enhance spontaneous emission rate(SER) of dipole emitter embedded in it. With properly designed parameters,numerical results show that SER-enhanced factors as high as 1.286 9 106 can be achieved. The influences of glass film thickness and chemical potential/doping level of graphene on spontaneous emission enhancement are also studied in this paper. A comparison is made between graphene and other coating materials such as gold and silver to see their performances in SER enhancement.

关键词： Graphene surface plasmons Graphene plasmonics quantum electrodynamics Superradiance Subwavelength structures

A Simple Scheme for the Preparation of Four-Photon GHZ States Based on Cavity QED

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Chinese Physics Letters 2010年第7期27卷 5-7页

作者：张登玉唐世清汪新文谢利军詹孝贵陈银花高峰 Department of Physics and Electronic Information Science and Research Institute of Photoelectricity Hengyang Normal University Hengyang 421008

A simple scheme is presented for generating four-photon Greenberger-Horne-Zeilinger states with a large detuned interaction between a three-level atom and two bimodal cavities. In the proposed protocol, the quantum information is encoded on Fock states of the cavity-fields, and the atomic spontaneous emission can be effectively suppressed due to the fact that the excited state of the atom is adiabatically eliminated under the large detuning condition. The detection of the atom can collapse the cavity to the desired state. The experimental feasibility of our proposal is also discussed.

关键词： SCHEMES (Algebraic geometry) quantum electrodynamics PHOTONS FEASIBILITY studies ATOMS HOLES ELECTRON emission

quantum storage of single photons with unknown arrival time and pulse shapes

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Chinese Physics B 2021年第8期30卷 388-391页

作者： Yu You Gong-Wei Lin Ling-Juan Feng Yue-Ping Niu Shang-Qing Gong Department of Physics East China University of Science and TechnologyShanghai 200237China School of Materials Science and Engineering East China University of Science and TechnologyShanghai 200237China College of Sciences Shanghai Institute of TechnologyShanghai 201418China Shanghai Engineering Research Center of Hierarchical Nanomaterials Shanghai 200237China

We present a scheme for the quantum storage of single photons using electromagnetically induced transparency(EIT)in a low-finesse optical cavity,assisted by state-selected spontaneous atomic *** by the dark mode of cavity EIT,the destructive quantum interference between the cavity input-output channel and state-selected atomic spontaneous emission leads to strong absorption of single photons with unknown arrival time and pulse *** discuss the application of this phenomenon to photon counting using stored light.

关键词： quantum information and processing quantum electrodynamics

Implementation of a Two-Atom √swap Gate in Cavity QED

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Chinese Physics Letters 2007年第3期24卷 599-601页

作者：刘琦叶柳 School of Physics and Material Science Anhui University Hefei 230039

We implement a two-atom √swap Bate via cavity QED. During the preparation, a cavity-assisted collision betweenatoms is required, and this does not need any auxiliary atom. The cavity is only virtually excited, thus our scheme is insensitive to the cavity field states and to the cavity decay. The scheme can be implemented by the present cavity QED techniques.

关键词： quantum electrodynamics COLLISIONS (Physics) ATOMS RADIOACTIVE decay NUCLEAR excitation quantum field theory