Auflistung nach Schlagwort "trapped ions"

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  • Cryogenic 9Be+ Penning trap for precision measurements with (anti-)protons 
    Niemann, M.; Meiners, T.; Mielke, J.; Borchert, M.J.; Cornejo, J.M.; Ulmer, S.; Ospelkaus, C. (Bristol : Institute of Physics Publishing, 2019)
    Cooling and detection schemes using laser cooling and methods of quantum logic can contribute to high precision CPT symmetry tests in the baryonic sector. This work introduces an experiment to sympathetically cool protons ...
  • Detecting metrologically useful entanglement in the vicinity of Dicke states 
    Apellaniz, Iagoba; Lücke, Bernd; Peise, Jan; Klempt, Carsten; Toth, Geza (Bristol : IOP Publishing Ltd., 2015-08-13)
    We present a method to verify the metrological usefulness of noisy Dicke states of a particle ensemble with only a few collective measurements, without the need for a direct measurement of the sensitivity. Our method ...
  • Detecting Multiparticle Entanglement of Dicke States 
    Lücke, Bernd; Peise, Jan; Vitagliano, Giuseppe; Arlt, Jan J.; Santos, Luis; Toth, Geza; Klempt, Carsten (College Park : American Physical Society, 2014)
    Recent experiments demonstrate the production of many thousands of neutral atoms entangled in their spin degrees of freedom. We present a criterion for estimating the amount of entanglement based on a measurement of the ...
  • Detection of motional ground state population of a trapped ion using delayed pulses 
    Gebert, Florian; Wan, Yong; Wolf, F.; Heip, J.C.; Schmidt, Piet O. (Bristol : Institute of Physics Publishing, 2016)
    Efficient preparation and detection of the motional state of trapped ions is important in many experiments ranging from quantum computation to precision spectroscopy. We investigate the stimulated Raman adiabatic passage ...
  • Entanglement in Ramsey interferometry, optical atomic clocks and trapped ions 
    Schulte, Marius (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2020)
    This thesis describes new results on the entanglement of atomic spins in Ramsey interferometry, optical atomic clocks and trapped ions. It is divided into three parts: First, we investigate improvements to conventional ...
  • Laser theory for quantum optomechanics 
    Lörch, Niels (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2015)
    [no abstract]
  • Precision spectroscopy by photon-recoil signal amplification 
    Wan, Yong; Gebert, Florian; Wuebbena, Jannes B.; Scharnhorst, Nils; Amairi, Sana; Leroux, Ian D.; Hemmerling, Boerge; Loerch, Niels; Hammerer, Klemens; Schmidt, Piet O. (London : Nature Publishing Group, 2014)
    Precision spectroscopy of atomic and molecular ions offers a window to new physics, but is typically limited to species with a cycling transition for laser cooling and detection. Quantum logic spectroscopy has overcome ...
  • Quantum logic inspired techniques for spacetime-symmetry tests with (anti-)protons 
    Cornejo, Juan M.; Lehnert, Ralf; Niemann, Malte; Mielke, Johannes; Meiners, Teresa; Bautista-Salvador, Amado; Schulte, Marius; Nitzschke, Diana; Borchert, Matthias J.; Hammerer, Klemens; Ulmer, Stefan; Ospelkaus, Christian ([London] : IOP, 2021)
    Cosmological observations as well as theoretical approaches to physics beyond the standard model provide strong motivations for experimental tests of fundamental symmetries, such as CPT invariance. In this context, the ...
  • Relativistic corrections and dynamic decoupling in trapped ion optical atomic clocks 
    Martínez Lahuerta, Víctor José (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)
    This thesis describes relativistic corrections and the use of dynamical decoupling in the context of trapped ion optical atomic clocks. The shifts that contribute to trapped ion optical atomic clocks can be divided into ...
  • Sympathetic cooling schemes for separately trapped ions coupled via image currents 
    Will, C.; Bohman, M.; Driscoll, T.; Wiesinger, M.; Abbass, F.; Borchert, M.J.; Devlin, J.A.; Erlewein, S.; Fleck, M.; Latacz, B.; Moller, R.; Mooser, A.; Popper, D.; Wursten, E.; Blaum, K.; Matsuda, Y.; Ospelkaus, C.; Quint, W.; Walz, J.; Smorra, C.; Ulmer, S. ([Bad Honnef] : Dt. Physikalische Ges., 2022)
    Cooling of particles to mK-temperatures is essential for a variety of experiments with trapped charged particles. However, many species of interest lack suitable electronic transitions for direct laser cooling. We study ...
  • Systematic study of tunable laser cooling for trapped-ion experiments 
    Kulosa, A.P.; Prudnikov, O.N.; Vadlejch, D.; Fürst, H.A.; Kirpichnikova, A.A.; Taichenachev, A.V.; Yudin, V.I.; Mehlstäubler, T.E. ([Bad Honnef] : Dt. Physikalische Ges., 2023)
    We report on a comparative analysis of quenched sideband cooling in trapped ions. We introduce a theoretical approach for time-efficient simulation of the temporal cooling characteristics and derive the optimal conditions ...
  • Two-qubit microwave quantum logic gate with 9Be+ ions in scalable surface-electrode ion traps 
    Hahn, Henning (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2019)
    Towards the goal of a large-scale quantum computer based on trapped ions, near-field microwaves represent a promising approach to perform the techni- cally challenging key operation of a two-qubit entangling gate. In this ...
  • Ultra-low vibration closed-cycle cryogenic surface-electrode ion trap apparatus 
    Dubielzig, Timko (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2021)
    Trapped ions are one of the leading platforms for building scalable quantum information processors. Current ion traps run on less than 100 qubits. A useful quantum computer needs to operate thousands or even millions of ...