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 Subjects -> ELECTRONICS (Total: 193 journals)
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 Journal of Physics B: Atomic, Molecular and Optical PhysicsJournal Prestige (SJR): 0.85 Citation Impact (citeScore): 2Number of Followers: 30      Hybrid journal (It can contain Open Access articles) ISSN (Print) 0953-4075 - ISSN (Online) 1361-6455 Published by IOP  [74 journals]
• Continuous-variable quantum computing in the quantum optical frequency
comb
• Authors: Olivier Pfister
First page: 012001
Abstract: This topical review introduces the theoretical and experimental advances in continuous-variable (CV)—i.e. qumode-based in lieu of qubit-based—large-scale, fault-tolerant quantum computing and quantum simulation. An introduction to the physics and mathematics of multipartite entangled CV cluster states is given, and their connection to experimental concepts is delineated. Paths toward fault tolerance are also presented. It is the hope of the author that this review attract more contributors to the field and promote its extension to the promising technology of integrated quantum photonics.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-25T00:00:00Z
DOI: 10.1088/1361-6455/ab526f
Issue No: Vol. 53, No. 1 (2019)

• Anisotropic interactions in electric field polarized ultracold Rydberg
gases
• Authors: Akbar Jahangiri; James P Shaffer, Luís Felipe Gonçalves Luis Gustavo Marcassa
First page: 014001
Abstract: We calculate pair potential curves for interacting Rydberg atoms in a constant electric field and use them to determine the effective C 3 dipole–dipole and C 6 van der Waals coefficients. We compare the C 3 and C 6 with experiments where the angle of a polarizing electric field is varied with respect to the axis of a quasi-1-dimensional trap at ultracold temperatures. The dipoles produced via polarization of the atoms have an angular dependent dipole–dipole interaction. We focus on the interaction potential of two rubidium Rydberg atoms in ##IMG## [http://ej.iop.org/images/0953-4075/53/1/014001/jpbab4d31ieqn1.gif] {$50{S}_{1/2}$} states in the blockade regime. For internuclear distances close to the blockade radius, R bl ≈ 4–6 μ m, molecular calculations are in much better agreement with experimental results than those based on the properties of single a...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-25T00:00:00Z
DOI: 10.1088/1361-6455/ab4d31
Issue No: Vol. 53, No. 1 (2019)

• Local time dependence of the magnetic sublevel population and polarization
• Authors: Zhan-Bin Chen
First page: 015202
Abstract: We investigate the time-dependence magnetic sublevel population and polarization of x-ray photoemission for the 1 s 2 p 3 P 2,1 → 1 s 2 1 S 0 lines of an exemplary ion Fe 24+ due to impact excitation by a longitudinally polarized electron beam. The analysis is performed based on the fully relativistic distorted-wave approximation and the magnetic sublevel-to-magnetic sublevel collisional-radiative model. The radiative cascade process and Breit interaction are considered to make the results more precise. The time evolution of the magnetic sublevel populations and circular polarization properties are discussed. Our results reveal for the first time that the variations of the magnetic sublevel populations demonstrate a pattern when the time is shorter than 10 3 ps; some of the populations increase rapidly, while the others remain relatively constant. These dramatic influences a...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-26T00:00:00Z
DOI: 10.1088/1361-6455/ab5038
Issue No: Vol. 53, No. 1 (2019)

• On the validity of weak measurement applied for precision measurement
• Authors: Yuichiro Mori; Jaeha Lee Izumi Tsutsui
First page: 015501
Abstract: We present a general framework of examining the validity of weak measurement—the standard procedure to acquire Aharonov’s weak value—which has been used intensively in recent years for precision measurement, exploiting the amplification mechanism available for the weak value. Our framework allows one to deal systematically with various causes of uncertainties intrinsic to the actual measurement process as well as those found in the theoretical analysis employed to describe the system. Using our framework, we examine in detail the two seminal experiments, Hosten’s detection measurement of the spin Hall effect of light [Hosten and Kwiat 2008 Science 319 787] and Dixon’s ultra sensitive beam deflection measurement [Dixon et al 2009 Phys. Rev. Lett. 102 173601]. Our analysis shows that their results are well within the range of amplification (actually in the vicinity of the optimal point) where the weak measurements are valid. This suggests that ou...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-25T00:00:00Z
DOI: 10.1088/1361-6455/ab5200
Issue No: Vol. 53, No. 1 (2019)

• Improvement of functionals in density functional theory by the inverse
Kohn–Sham method and density functional perturbation theory
• Authors: Tomoya Naito; Daisuke Ohashi Haozhao Liang
First page: 245003
Abstract: We propose a way to improve energy density functionals (EDFs) in density functional theory based on the combination of the inverse Kohn–Sham method and the density functional perturbation theory. Difference between the known EDF and the exact one is treated as the first-order perturbation. As benchmark calculations, we reproduce the theoretical exchange and correlation functionals in the local density approximation. Systems of noble-gas atoms are used for benchmark calculations, and the ground-state energies and densities, as well as the functionals, are reproduced with good accuracies.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-19T00:00:00Z
DOI: 10.1088/1361-6455/ab4eef
Issue No: Vol. 52, No. 24 (2019)

• Effective fully differential cross-section in single ionization of helium
by fast ions
• Authors: A Igarashi; L Gulyás
First page: 245203
Abstract: Fully differential measurements for the single ionization of helium by fast ion impacts are discussed by evaluating effective fully differential cross-sections (EFDCSs) proposed by Kouzakov (2017 Eur. Phys. J. D 71 63) where the coherence properties of the projectile and the target beams are taken into account. The present evaluation of the EFDCS is extended by including instrumental uncertainties. The experimental data are compared with theoretical results where the electron emission is described within the framework of the continuum distorted wave with eikonal initial state (CDW-EIS) method. In most cases, the obtained EFDCSs agree with the experimental data better than those evaluated without considering coherence properties and inclusion of experimental uncertainties.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-13T00:00:00Z
DOI: 10.1088/1361-6455/ab46fe
Issue No: Vol. 52, No. 24 (2019)

• Suppressing deleterious effects of spontaneous emission in creating bound
states in cold atom continuum
• Authors: Somnath Naskar; Dibyendu Sardar, Bimalendu Deb G S Agarwal
First page: 245204
Abstract: In a previous paper [Deb and Agarwal 2014 Phys. Rev. A 90 063417], it was theoretically shown that, magneto-optical manipulation of low energy scattering resonances and atom-molecule transitions could lead to the formation of a bound state in continuum (BIC), provided there is no spontaneous emission. We find that even an exceedingly small spontaneous decay from exited molecular states can spoil the BIC. In this paper, we show how to circumvent the detrimental effect of spontaneous emission by making use of vacuum-induced coherence (VIC) which results in the cancellation or suppression of spontaneous emission. VIC occurs due to the destructive interference between two spontaneous decay pathways. An essential condition for VIC is the non-orthogonality of two transition dipole moments associated with the radiative decays form two excited states. Furthermore, the interference between two decay pathways requires that the spacing between the two decaying states must be ...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-19T00:00:00Z
DOI: 10.1088/1361-6455/ab4ef2
Issue No: Vol. 52, No. 24 (2019)

• Electron-impact ionization of the Kr atom
• Authors: M S Pindzola; S D Loch
First page: 245205
Abstract: Electron-impact ionization cross sections are calculated for the ground configuration of the Kr atom. Time-dependent close-coupling cross sections for the direct ionization of the 4 s and 4 p subshells leading to single ionization are found to be a factor of 2 smaller than distorted-wave calculations due to the presence of strong continuum correlation effects. With the inclusion of relatively small ##IMG## [http://ej.iop.org/images/0953-4075/52/24/245205/jpbab4c5eieqn1.gif] {$4s\to {nl}$} excitation-autoionization contributions, the total single ionization cross sections for Kr are found to be slightly larger than crossed-beams experimental measurements.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-19T00:00:00Z
DOI: 10.1088/1361-6455/ab4c5e
Issue No: Vol. 52, No. 24 (2019)

• Quasi-one-dimensional approximation for Bose–Einstein condensates
transversely trapped by a funnel potential
• Authors: Mateus C P dos Santos; Boris A Malomed Wesley B Cardoso
First page: 245301
Abstract: Starting from the standard three-dimensional (3D) Gross–Pitaevskii equation (GPE) and using a variational approximation, we derive an effective one-dimensional nonpolynomial Schrödinger equation (1D-NPSE) governing the axial dynamics of atomic Bose–Einstein condensates (BECs) under the action of a singular but physically relevant funnel-shaped transverse trap, i.e. an attractive 2D potential ∼−1/ r (where r is the radial coordinate in the transverse plane), in combination with the repulsive self-interaction. Wave functions of the trapped BEC are regular, in spite of the potential’s singularity. The model applies to a condensate of particles (small molecules) carrying a permanent electric dipole moment in the field of a uniformly charged axial thread, as well as to a quantum gas of magnetic atoms pulled by an axial electric current. By means of numerical simulations, we verify that the effective 1D-NPSE provides accurate static and dynamical results, in compar...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-19T00:00:00Z
DOI: 10.1088/1361-6455/ab4fb7
Issue No: Vol. 52, No. 24 (2019)

• Gaussian multipartite quantum discord from classical mutual information
First page: 245501
Abstract: Quantum discord is a measure of non-classical correlations, which are excess correlations inherent in quantum states that cannot be accessed by classical measurements. For multipartite states, the classically accessible correlations can be defined by the mutual information of the multipartite measurement outcomes. In general the quantum discord of an arbitrary quantum state involves an optimisation of over the classical measurements which is hard to compute. In this paper, we examine the quantum discord in the experimentally relevant case when the quantum states are Gaussian and the measurements are restricted to Gaussian measurements. We perform the optimisation over the measurements to find the Gaussian discord of the bipartite EPR state and tripartite GHZ state in the presence of different types of noise: uncorrelated noise, multiplicative noise and correlated noise. We find that by adding uncorrelated noise and multiplicative noise, the quantum discord always decreases. Howe...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-11-19T00:00:00Z
DOI: 10.1088/1361-6455/ab443c
Issue No: Vol. 52, No. 24 (2019)

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