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 Subjects -> ELECTRONICS (Total: 188 journals)
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 Journal of Physics B: Atomic, Molecular and Optical PhysicsJournal Prestige (SJR): 0.85 Citation Impact (citeScore): 2Number of Followers: 29      Hybrid journal (It can contain Open Access articles) ISSN (Print) 0953-4075 - ISSN (Online) 1361-6455 Published by IOP  [74 journals]
• Quantum state preparation of an atomic ensemble via cavity-assisted
homodyne measurement
• Authors: Yan-Lei Zhang; Chuan-Sheng Yang, Chang-Ling Zou, Tian Xia, Guang-Can Guo Xu-Bo Zou
First page: 215003
Abstract: The quantum spin states of an atomic ensemble are of special interest to both fundamental studies and precision measurement applications. Here, we propose a scheme to prepare collective quantum states of an atomic ensemble placed in an optical cavity via homodyne measurement of a probing light field. The effective interactions of atoms mediated by photons are enhanced by the optical cavity, and the output probe light could also be entangled with the collective spin states. By selectively measuring the quadrature of the output light, we can prepare various quantum states, including superposition states of Dicke states and Dicke squeezed states. It is also demonstrated that the fidelity of the prepared quantum state can be enhanced by repetitive homodyne detection and using longer probe laser pulses. With the experimental parameters, we discuss some imperfections, including background noise, fluctuation of the measurement outcomes, and free-space scattering.We believe that our sch...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-10T23:00:00Z
DOI: 10.1088/1361-6455/ab42cc
Issue No: Vol. 52, No. 21 (2019)

• The molybdenum K-shell x-ray emission spectrum
• Authors: Marcus H Mendenhall; Lawrence T Hudson, Csilla I Szabo, Albert Henins James P Cline
First page: 215004
Abstract: We present newly measured spectra of the x-ray emission of a molybdenum metal anode subject to electron bombardment, using a very high dispersion silicon double-crystal spectrometer. The measurement includes the dipole-allowed KL , KM , and KN emission lines, based on an energy scale traceable to the Système International definition of the meter with a systematic uncertainty below ##IMG## [http://ej.iop.org/images/0953-4075/52/21/215004/jpbab45d6ieqn1.gif] {${\rm{\Delta }}E/E={10}^{-6}$} . The data are presented as parametrized multi-Lorentzian fits to the results, and as supplementary data with the complete spectrum of each line group, corrected for instrumental effects. The ##IMG## [http://ej.iop.org/images/0953-4075/52/21/215004/jpbab45d6ieqn2.gif] {$\mathrm{Mo}\,{{KL}}_{3}$} ( ##IMG## [http://ej.iop.org/images/0953-4075/52/21/215004/jpbab45d6ieqn3.gif] {$K{\alpha }_{1}$} ) line energy was in co...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-14T23:00:00Z
DOI: 10.1088/1361-6455/ab45d6
Issue No: Vol. 52, No. 21 (2019)

• Blackbody radiation shift for the
##IMG## [http://ej.iop.org/images/0953-4075/52/21/215005/toc_jpbab4434ieqn1.gif] {${}^{1}{{\rm{S}}}_{0}{-}^{3}{{\rm{P}}}_{0}$}
optical clock transition in zinc and cadmium atoms
• Authors: Vladimir A Dzuba; Andrei Derevianko
First page: 215005
Abstract: Black-body radiation (BBR) shifts of the 1 S 0 – 3 P 0 clock transition in divalent atoms Cd and Zn are evaluated using accurate relativistic many-body techniques of atomic structure. Static polarizabilities of the clock levels and relevant electric-dipole matrix elements are computed. We also present a comparative overview of the BBR shifts in optical clocks based on neutral divalent atoms trapped in optical lattices. Zinc and cadmium atoms have one of the smallest BBR clock shifts, mitigating the largest inaccuracy in optical lattice clocks.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-14T23:00:00Z
DOI: 10.1088/1361-6455/ab4434
Issue No: Vol. 52, No. 21 (2019)

• Semiempirical models for low energy positron scattering by Ar, Kr and Xe
• Authors: Felipe Arretche; Marcos V Barp, Adolfo Scheidt, Eliton Popovicz Seidel Wagner Tenfen
First page: 215201
Abstract: Positron scattering by Ar, Kr and Xe was investigated considering two well-established semiempirical potentials with different descriptions of the asymptotic positron–atom scattering potential. Exploring the ultimate nature of semiempirical formulations, two independent semiempirical models were studied. In the first model, the potential parameters were fixed to reproduce the experimental values of the positron–atom scattering length, while, in the second, they were tuned to better fit experimental absolute folded differential cross sections through a χ 2 approach. Results showed that the introduction of higher order polarisabilities and hyperpolarisabilities considerably improved the description of the forward scattering and the total and grand-total experimental low energy cross sections.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-07T23:00:00Z
DOI: 10.1088/1361-6455/ab4027
Issue No: Vol. 52, No. 21 (2019)

• Dominance of the density effects in the magnetic sublevel population and
• Authors: Zhan-Bin Chen
First page: 215202
Abstract: On the basis of the fully relativistic distorted-wave treatment of impact excitation by a longitudinally polarized electron beam, we have assessed the influence of density effects on the magnetic sublevel population and circular polarization of x-ray radiation, taking the 1 s 2 p 3 P 2  ##IMG## [http://ej.iop.org/images/0953-4075/52/21/215202/jpbab3133ieqn1.gif] {$\to$} 1 s 2 1 S 0 line of selected He-like Ne 8+ , Ar 16+ , and Kr 34+ ions as an example. Starting from the most general method of rate equation, we carried out specific analytic expressions in terms of the magnetic sublevel-to-magnetic sublevel collisional-radiative model, corresponding to different states. It is shown that the density contributions to the magnetic sublevel population can be considerable. These dramatic influences also lead to a remarkable decrease in the circular po...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-07T23:00:00Z
DOI: 10.1088/1361-6455/ab3133
Issue No: Vol. 52, No. 21 (2019)

• Fluid structure of 1D spinful Fermi gases with long-range interactions
• Authors: E Colella; M L Chiofalo, M Barsanti, D Rossini R Citro
First page: 215301
Abstract: We discuss the fluid structure in the quantum phases of a 1D spinful Fermi gas of atoms interacting via an infinitely long-range coupling, as it may result from a photon-mediated two-body coupling in optical cavities. The system reveals a rich physics, where the spin/charge-density wave and superfluid-like order compete with each other. Following our previous work based on a combined mean-field, exact diagonalization and bosonization analysis, we provide the phase diagram of the system and discuss the structure of the fluid, addressing the main features in momentum space of the order parameters, momentum distribution and two-body correlations. We highlight that the nesting of the Fermi surface in 1D ultimately drives the formation of periodic structures commensurate with the cavity-induced mean-field potential.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-10T23:00:00Z
DOI: 10.1088/1361-6455/ab410f
Issue No: Vol. 52, No. 21 (2019)

• Controllable movement and entanglement of atoms on an optical lattice
• Authors: Jia-Chong Zhang; Shi-Jie Yang
First page: 215302
Abstract: The movement of atoms on an optical superlattice can be controlled by applying an AC field. We manipulate the coherent destructive tunneling effects by modulating the phase and amplitude of the driving field. By moving and mixing two particles we can create various quantum entanglement states of atoms. Our method may provide an alternative route towards quantum computing and quantum information with cold atom systems.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-14T23:00:00Z
DOI: 10.1088/1361-6455/ab4021
Issue No: Vol. 52, No. 21 (2019)

• Probing relaxation dynamics of a few strongly correlated bosons in a 1D
triple well optical lattice
• Authors: S Bera; R Roy, A Gammal, B Chakrabarti B Chatterjee
First page: 215303
Abstract: The relaxation process of a few strongly interacting bosons in a triple well optical lattice is studied from the first principle using the multiconfigurational time-dependent Hartree method for bosons. We report the contrasting response of the system under two independent quench processes: an interaction quench and a lattice depth quench. We analyze the evolution of the reduced one-body density matrix, two-body density and the Shannon information entropy for a wide range of lattice depth and interaction strength parameters. For the strong interaction quench, we observe a very fast relaxation to the steady state. In contrast, for the lattice depth quench, we observe collapse–revival dynamics in all the key measures. We also provide the best fitting formulas for relaxation and revival time which follow power law decay.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-14T23:00:00Z
DOI: 10.1088/1361-6455/ab2999
Issue No: Vol. 52, No. 21 (2019)

• Tunable transparency and amplification in a hybrid optomechanical system
• Authors: Cheng Jiang; Yuanshun Cui, Zhangyin Zhai, Hualing Yu, Xiaowei Li Guibin Chen
First page: 215402
Abstract: We theoretically study the optical response of a hybrid optomechanical system with quadratic coupling, where an optomechanical cavity with a movable membrane in the middle is coupled to an auxiliary cavity with a tunable gain rate. We show that the optical transmission of the system can be controlled by a variety of parameters, including power of the control field, coupling strength between the two cavities, the gain rate of the auxiliary cavity, reflectivity of the membrane, and the temperature of the environment. In particular, tunable transparency and amplification can be realized by modifying the gain rate of the auxiliary cavity. Under the condition of two-phonon resonance, we find that (i) for the no-loss-gain cavity, a broad transparency window appears in the probe transmission due to the coupling between the two cavities; (ii) for the passive cavity, an extremely narrow transparency window occurs within a broad transmission window due to quadratic optomechanical coupling...
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-07T23:00:00Z
DOI: 10.1088/1361-6455/ab406e
Issue No: Vol. 52, No. 21 (2019)

• Optimal quantum estimation of the displacement in optical imaging
• Authors: Yang Gao; Le-Man Kuang
First page: 215403
Abstract: We present a general method to find the ultimate limits on the resolution of optical image on a surface perpendicular to the light beam propagation. We prove that the optimal sensitivity always obeys the standard quantum limit for a single mode light. In the absence of photon losses, we find the possibility to achieve the Heisenberg limit by using two-mode or multi-mode lights. We also use the variational approach to obtain the lower bound on the sensitivity considering the effects of photon losses.
Citation: Journal of Physics B: Atomic, Molecular and Optical Physics
PubDate: 2019-10-07T23:00:00Z
DOI: 10.1088/1361-6455/ab42b7
Issue No: Vol. 52, No. 21 (2019)

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