Effects of QED and Beyond from the Atomic Binding Energy

Atomic binding energies are calculated at utmost precision. A report on the current status of Lamb-shift predictions for hydrogenlike ions, including all quantum electrodynamical corrections to first and second order in the fine structure constant α is presented. All relevant nuclear effects are taken into account. High-precision calculations for the Lamb shift in hydrogen are presented. The hyperfine structure splitting and the g factor of a bound electron in the strong electromagnetic field of a heavy nucleus is considered. Special emphasis is also put on parity violation effects in atomic systems. For all systems possible investigations beyond precision tests of quantum electrodynamics are considered. This revised version was published online in July 2006 with corrections to the Cover Date.     

QED Theory of Transition Probabilities and Line Profiles in Highly Charged Ions

A rigorous QED theory of the spectral line profiles is applied to transition probabilities in few-electron highly charged ions. Interelectron interaction corrections are included as well as radiative corrections. Parity nonconserving (PNC) amplitudes with effective weak interactions between the electrons and nucleus are also considered. QED and interelectron interaction corrections to the PNC amplitudes are derived.     

高离化类铜离子4s—4p跃迁的理论计算与量子电动力学效应

采用相对论多组态从头计算方法，系统计算了高离化类铜离子等电子序列Ｉｎ２０－Ｕ６３＋（Ｚ＝４９～９２）４ｓ－４ｐ跃迁波长和能级间隔，计算结果与文献的实验值和计算值作了比较。结果表明，在高离化类铜离子体系中存在更显著的量子电子动力学效应。     

重离子熔合反应的相互作用势

运用Skyrme势及快过程近似与绝热过程近似两种极限,计算了几组重离子之间的相互作用势,应用此相互作用势计算了熔合反应截面,与实验结果进行了比较.     

Ground state Lamb-shift of heavy hydrogen-like ions: status and perspectives

We present the current status in experimental investigations of the heaviest hydrogen-like systems at the Experimental Storage Ring (ESR) at GSI Darmstadt. Together with the most recent theoretical predictions the present experimental result provides a test of the leading quantum electrodynamical (QED) contributions on a percent level. In addition, the planned future experimental studies and related developments devoted to high-resolution spectroscopy of the ground-state in high-Z hydrogen-like systems are reviewed.     

Statistical Model of Dielectronic Recombination of Heavy Ions in Plasmas

Calculation of the total dielectronic recombination (DR) rates was done in the frame of a statistical model of atoms. The model is based on the idea of collective excitations of atomic electrons with the local plasma frequency, which depends on atomic electrons density distribution. The electron density is described in a frame of the Thomas‐Fermi model of atoms. Simple scaling laws for temperature T_e and nuclear charge Z dependences follow from the statistical model of DR. Results of the statistical model were compared with other numerical data following detailed level‐by‐level computations for different multielectron ions. The specific attention is paid to Ni‐like ion sequences of different chemical elements in order to check the Z ‐dependence of DR rates. A comparison with numerical data of Flexible Atomic Code (FAC) is presented for tungsten ions. The reasonable correspondence between the statistical model and the detailed numerical data is demonstrated. The application of the statistical model provides very simple and fast calculations of the DR rates useful in modern plasma modelling. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Two photon QED corrections in helium like highly charged ions

An overview of calculations and measurements of the energy levels of helium-like ions is presented. We focus on the two-photon QED effects, and conclude that measurements of the excited states of large Z helium-like ions are desired. This revised version was published online in August 2006 with corrections to the Cover Date.     

肿瘤治疗的重离子束物理性质研究

重离子在肿瘤治疗方面的优势主要是由于其优越的物理性质，因此，研究其与生物体相互作用也就成为肿瘤治疗中的基本课题，介绍一些研究结果来解决人们关心的问题.The advance of tumor therapy with heavy ions beam is due to the physics quality of heavy ions.So,the investigation of heavy ions action with biological materials will be a basic task. In the paper, the investigated results show a picture to resolve some problems which attract people＇s attention.     

Vacuum-Polarization Screening Corrections to the Low-Lying Energy Levels of Heliumlike Ions

We present results for the two-photon vacuum-polarization screening correction in He-like heavy ions in the range Z=20–100. Values for the ground state as well as for low-lying excited states are given. This revised version was published online in July 2006 with corrections to the Cover Date.     

QED of strong fields: Status and recent developments

We discuss the status and open problems of recent calculations on QED effects in heavy few-electron ions. In particular, we examine corrections in these systems which are not of quantum electrodynamical origin but which might influence energy shifts on the same order-of-magnitude as the accuracy of present-day QED calculations. This revised version was published online in July 2006 with corrections to the Cover Date.     

Preparation of the four-qubit cluster states in cavity QED and the trapped-ion system

This paper proposes a simple scheme to generate a four-atom entangled cluster state in cavity quantum electrodynamics. With the assistantce of a strong classical field the cavity is only virtually excited and no quantum information will be transferred from the atoms to the cavity during the preparation for a four-atom entangled cluster state, and thus the scheme is insensitive to the cavity field states and cavity decay. Assuming that deviation of laser intensity is 0.01 and that of simultaneity for the interaction is 0.01, it shows that the fidelity of the resulting four-atom entangled cluster state is about 0.9886. The scheme can also be used to generate a four-ion entangled cluster state in a hot trapped-ion system. Assuming that deviation of laser intensity is 0.01, it shows that the fidelity of the resulting four-ion entangled cluster state is about 0.9990. Experimental feasibility for achieving this scheme is also discussed.     

Lamb shift calculations for high-Z lithium like ions

We present ab initio calculations of the complete gauge invariant set of the self energy and vacuum polarization screening diagrams for the 2p transition in Li like ions. Various contributions to the transition energy are collected. The accuracy of theoretical predictions is discussed. This revised version was published online in August 2006 with corrections to the Cover Date.     

Negative energy correction for nuclear polarization in muonic atoms

Negative energy corrections to the conventional calculations of nuclear polarization effects in muonic atoms are calculated. It is shown that the corrections are negligible as far as the NP effects due to low lying nuclear states and states in the giant resonance regions are concerned. However, the formula used for the muonic NP calculations breaks down if nuclear excitations with larger energies than the muonic mass are considered. This means that the method cannot be used for calculations of NP effects in electronic atoms. This revised version was published online in August 2006 with corrections to the Cover Date.     

Evaluation of the Two-Photon Self-Energy Correction for Hydrogenlike Ions

We report on the recent evaluation of the two-photon electron self energy to all orders in the interaction with the Coulomb field of the nucleus. With the present results at hand the major theoretical uncertainty is diminished, which provides predictions of the ground-state energy with a relative accuracy of about 10⁻⁶ for the hydrogenlike uranium and lead systems. This allows for high-precision tests of quantum electrodynamics (QED) in strong fields that are expected to be experimentally available in the near future. This revised version was published online in July 2006 with corrections to the Cover Date.     

Testing of QED-Theory and Precise Measurements of the Rydberg Series for the He-Like Multicharged Ions

The wavelengths of the 1snp ¹ P ₁−1s ^{2 1} S ₀ transitions in He-like Mg XI, F VIII (n= 4–8) and Al XII (n=6,9) have been calculated in the framework of the 1/Z expansion method including relativistic effects and QED contributions. It is found that QED corrections to the ground-state ionization energy are significant at the present level of experimental accuracy. This revised version was published online in July 2006 with corrections to the Cover Date.     

Simple Scheme for Realizing the General Conditional Phase Shift Gate and aSimulation of Quantum Fourier Transform in Circuit QED

We propose a theoretical scheme for realizing the generalconditional phase shift gate of charge qubits situated in ahigh-Q superconducting transmission line resonator. Thephase shifting angle can be tuned from 0 to 2π by simplyadjusting the qubit-resonator detuning and the interaction time.Based on this gate proposal, we give a detailed procedure toimplement the three-qubit quantum Fourier transform withcircuit quantum electrodynamics (QED). A careful analysis of thedecoherence sources shows that the algorithm can be achieved with ahigh fidelity using current circuit QED techniques.     

Implementing Deutsch-Jozsa Algorithm in Cavity QED

We propose a simple scheme for implementing Deutsch-Jozsa algorithm in cavity QED. Our scheme is insensitive to both the cavity decay and thermal field because we use the large-detuned interaction. The scheme would be important to constructing practical computer in cavity QED system.     

Nonrelativistic calculation of the Lamb shift to order α

It is demonstrated, for the first time to our knowledge, that the Lamb-shift calculation for all states of hydrogenic atoms can be carried out to order α⁵ by applying the methods of nonrelativistic quantum electrodynamics and without using the Dirac equation and the second quantization for the electron. The extremely small deviations from the standard relativistic results were calculated for different S- and non-S-states as well.     

不同离子激发Au靶的多电离效应

重离子与固体表面相互作用时,会引起靶原子内壳层的电离,相应空穴退激过程中发射的X射线对研究重离子与固体表面的相互作用有着重要意义,可为相关研究提供基础数据.目前,在K和L壳层电离方面做了一些工作,而M壳层的研究较少,本文依托兰州重离子加速器国家实验室320 kV高电荷态离子综合研究平台,测量了不同能量的H~+, Ar~(8+), Ar~(12+), Kr~(13+)和Eu~(20+)离子与Au表面作用产生的特征X射线谱及其能移,计算了X射线的产额比值.结果表明:重离子引起了靶原子内壳层的多电离,多电离效应使Au的MX射线有不同程度的能移;多电离程度取决于入射离子能量、离子的原子序数和其外壳层的空穴数量.