Auflistung nach Schlagwort "Quantum theory"

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  • High-precision cavity spectroscopy using high-frequency squeezed light 
    Junker, J.; Wilken, D.; Huntington, E.; Heurs, Michèle (Washington, DC : The Optical Society, 2021)
    In this article, we present a novel spectroscopy technique that improves the signal-to-shot-noise ratio without the need to increase the laser power. Detrimental effects by technical noise sources are avoided by ...
  • Inferring effective field observables from a discrete model 
    Bény, Cédric (Bristol : Institute of Physics Publishing, 2017)
    A spin system on a lattice can usually be modeled at large scales by an effective quantum field theory. A key mathematical result relating the two descriptions is the quantum central limit theorem, which shows that certain ...
  • Jones index, secret sharing and total quantum dimension 
    Fiedler, Leander; Naaijkens, Pieter; Osborne, Tobias J. (Bristol : Institute of Physics Publishing, 2017)
    We study the total quantum dimension in the thermodynamic limit of topologically ordered systems. In particular, using the anyons (or superselection sectors) of such models, we define a secret sharing scheme, storing ...
  • Kondo effect in a few-electron quantum ring 
    Keyser, U.F.; Fühner, C.; Borck, S.; Haug, Rolf J.; Bichler, M.; Abstreiter, G.; Wegscheider, W. (College Park, MD : American Physical Society, 2003)
    A small tuneable quantum ring with less than ten electrons was shown to exhibit Aharonov-Bohm oscillations as well as Coulomb blockade. At strong coupling to the leads, evidence of a Kondo effect induced by a single spin ...
  • The magnetic moments of the proton and the antiproton 
    Ulmer, S.; Mooser, A.; Blaum, K.; Braeuninger, S.; Franke, K.; Kracke, H.; Leiteritz, C.; Matsuda, Y.; Nagahama, H.; Ospelkaus, C.; Rodegheri, C.C.; Quint, W.; Schneider, G.; Smorra, C.; Van Gorp, S.; Walz, J.; Yamazaki, Y. (Bristol : Institute of Physics Publishing, 2014)
    Recent exciting progress in the preparation and manipulation of the motional quantum states of a single trapped proton enabled the first direct detection of the particle's spin state. Based on this success the proton ...
  • Micro-optical Realization of Arrays of Selectively Addressable Dipole Traps: A Scalable Configuration for Quantum Computation with Atomic Qubits 
    Dumke, R.; Volk, M.; Müther, T.; Buchkremer, F.B.J.; Birkl, G.; Ertmer, Wolfgang (American Physical Society, 2002)
    We experimentally demonstrate novel structures for the realization of registers of atomic qubits: We trap neutral atoms in one- and two-dimensional arrays of far-detuned dipole traps obtained by focusing a red-detuned laser ...
  • Molecular switching in iron complexes bridged via tin-cyanides observed by Mössbauer and ESR spectroscopy 
    Jung, S.; Renz, Franz; Klein, M.; Menzel, M.; Boča, R.; Stößer, R. (Bristol : IOP Publishing Ltd., 2010)
    The precursor [FeIII(L)Cl] (LH2 N,N'-bis(2'-hydroxy- 3'-X-benzyliden)-1,6-diamino-3-N-hexane) is a high-spin (S 5/2) complex (with X -CH3, -O-CH3). This precursor is combined with the bridging unit [SnIV(CN)4] to yield ...
  • Multiple transitions of the spin configuration in quantum dots 
    Rogge, M.C.; Fühner, C.; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    Single electron tunneling is studied in a many electron quantum dot in high magnetic fields. For such a system multiple transitions of the spin configuration are theoretically predicted. With a combination of spin blockade ...
  • Numerical analysis of LG3,3 second harmonic generation in comparison to the LG0,0 case 
    Heinze, Joscha; Vahlbruch, Henning; Willke, Benno (Washington, DC : OSA - The Optical Society, 2020)
    For coating Brownian thermal noise reduction in future gravitational wave detectors, it is proposed to use light in the helical Laguerre-Gaussian LG3,3 mode instead of the currently used LG0,0 mode. However, the simultaneous ...
  • Observation of phase fluctuations in elongated bose-einstein condensates 
    Dettmer, S.; Hellweg, D.; Ryytty, P.; Arlt, Jan J.; Ertmer, Wolfgang; Sengstock, K.; Petrov, D.S.; Shlyapnikov, G.V.; Kreutzmann, H.; Santos, Luis; Lewenstein, M. (American Physical Society, 2001)
    The occurrence of phase fluctuations due to thermal excitations in Bose-Einstein condensates (BECs) is studied for a variety of temperatures and trap geometries. We observe the statistical nature of the appearance of phase ...
  • Optimal Ramsey interferometry with echo protocols based on one-axis twisting 
    Scharnagl, M.S.; Kielinski, T.; Hammerer, K. (Woodbury, NY : Inst., 2023)
    We study a variational class of generalized Ramsey protocols that include two one-axis twisting (OAT) operations, one performed before the phase imprint and the other after. In this framework, we optimize the axes of the ...
  • Organic-silicon Solar Cells Exceeding 20% Efficiency 
    Zielke, Dimitri; Niehaves, Claudia; Lövenich, Wilfried; Elschner, Andreas; Hörteis, Matthias; Schmidt, Jan (Amsterdam : Elsevier, 2015)
    Aftera briefreview of therecent evolvement oforganic-silicon heterojunction solar cells,we present here our latest measurements of the saturation current densities (J0) and contact resistances (RC) of crystalline silicon ...
  • Phonon excitations of composite-fermion Landau levels 
    Schulze-Wischeler, F.; Hohls, Frank; Zeitler, U.; Reuter, D.; Wieck, A.D.; Haug, Rolf J. (College Park, MD : American Physical Society, 2004)
    The phonon excitations of fractional quantum Hall (FQH) states at filling factors ν =1÷3,2÷5, 4÷7, 3÷5, 4÷3, and 5÷3 were investigated. The excitations were found to be based on Landau-level transitions of composite fermions ...
  • Physical and chemical induced spin crossover 
    Renz, Franz (Bristol : IOP Publishing Ltd., 2010)
    Physical spin crossover (spin transition), one of the most fascinating dynamic electronic structure phenomena occurring in coordination compounds of third row transition metal ions, mostly of iron(II), iron(III) and ...
  • Precision Isotope Shift Measurements in Calcium Ions Using Quantum Logic Detection Schemes 
    Gebert, Florian; Wan, Yong; Wolf, Fabian; Angstmann, Christopher N.; Berengut, Julian C.; Schmidt, Piet O. (College Park, MD : American Physical Society, 2015)
    We demonstrate an efficient high-precision optical spectroscopy technique for single trapped ions with nonclosed transitions. In a double-shelving technique, the absorption of a single photon is first amplified to several ...
  • Quantum Algorithmic Readout in Multi-Ion Clocks 
    Schulte, M.; Lörch, N.; Leroux, I.D.; Schmidt, Piet O.; Hammerer, K. (College Park, MD : American Physical Society, 2016)
    Optical clocks based on ensembles of trapped ions promise record frequency accuracy with good short-term stability. Most suitable ion species lack closed transitions, so the clock signal must be read out indirectly by ...
  • Quantum noise limits to simultaneous quadrature amplitude and phase stabilization of solid-state lasers 
    Huntington, E.H.; Harb, C.C.; Heurs, Michèle; Ralph, T.C. (College Park, MD : American Physical Society, 2007)
    A quantum mechanical model is formulated to describe the coupling between pump intensity noise and laser frequency noise in a solid-state laser. The model allows us to investigate the limiting effects of closed-loop ...
  • The quantum technologies roadmap: A European community view 
    Acín, Antonio; Bloch, Immanuel; Buhrman, Harry; Calarco, Tommaso; Eichler, Christopher; Eisert, Jens; Esteve, Daniel; Gisin, Nicolas; Glaser, Steffen J.; Jelezko, Fedor; Kuhr, Stefan; Lewenstein, Maciej; Riedel, Max F.; Schmidt, Piet O.; Thew, Rob; Wallraff, Andreas; Walmsley, Ian; Wilhelm, Frank K. (Bristol : Institute of Physics Publishing, 2018)
    Within the last two decades, quantum technologies (QT) have made tremendous progress, moving from Nobel Prize award-winning experiments on quantum physics (1997: Chu, Cohen-Tanoudji, Phillips; 2001: Cornell, Ketterle, ...
  • Quantum-Fluctuation-driven crossover from a dilute bose-einstein condensate to a macrodroplet in a dipolar quantum fluid 
    Chomaz, L.; Baier, S.; Petter, D.; Mark, M.J.; Wächtler, F.; Santos, Luis; Ferlaino, F. (College Park, MD : American Physical Society, 2016)
    In a joint experimental, theoretical effort, we report on the formation of a macrodroplet state in an ultracold bosonic gas of erbium atoms with strong dipolar interactions. By precise tuning of the s-wave scattering length ...
  • Simulation in thin film technology 
    Turowski, Marcus; Jupé, Marco; Ehlers, Henrik; Melzig, Thomas; Pflug, Andreas; Ristau, Detlev (Bellingham, WA : S P I E - International Society for Optical Engineering, 2015)
    Simulation and modeling find more and more their way into thin film technology. Beside theoretical models for layer design, pre-production design analysis, and real time process control, atomistic simulation techniques ...