Browsing by Subject "Quantum theory"

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  • Haegeman, Jutho; Cirac, J. Ignacio; Osborne, Tobias J.; Verschelde, Henri; Verstraete, Frank (Trieste : International School for Advanced Studies, 2010)
    We extend the recently introduced continuous matrix product state (cMPS) variational class to the setting of (1+1)-dimensional relativistic quantum field theories. This allows one to overcome the difficulties highlighted ...
  • Stößer, R.; Menzel, M.; Feist, M.; Nofz, M.; Renz, Franz (Bristol : IOP Publishing Ltd., 2010)
    The investigation of iron-doped AlO(OH)/Al2O3 systems revealed that the combined employment of Mössbauer and ESR spectroscopies together with thermal analysis yields meaningful data with complementary information. This ...
  • Mühle, A.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2007)
    We designed a device consisting of two concentric quantum rings in a GaAsAlGaAs heterostructure. The outer ring is connected to leads while the inner ring is only capacitively coupled to the rest of the system. Measuring ...
  • 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 ...
  • Schulze-Wischeler, F.; Mariani, E.; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Physical Society, 2004)
    The activation gap δ of the fractional quantum Hall states was measured as a function of the perpendicular magnetic field. A linear dependence of δ on magnetic field was observed while approaching the spin-polarization ...
  • Hohls, Frank; Zeitler, U.; Haug, Rolf J.; Meisels, R.; Dybko, K.; Kuchar, F. (College Park, MD : American Physical Society, 2002)
    The dynamical scaling of the quantum Hall plateau phase transition in the frequency range 0.1-55 GHz was examined. A universal scaling function was observed, yielding a dynamical exponent 0.9 ± 0.2. The universal behavior ...
  • Asthalter, T.; Sergueev, I.; Van Bürck, U.; Wagner, F.E.; Härter, P.; Kornatowski, J.; Klingelhöfer, S.; Behrens, Peter (Bristol : IOP Publishing Ltd., 2010)
    A detailed study on the slow dynamics of ferrocene in the unidimensional channels of the molecular sieves SSZ-24 and AlPO4-5 has been carried out, using Mössbauer spectroscopy (MS), nuclear forward scattering (NFS) and ...
  • Wan, Yong; Gebert, Florian; Wolf, Fabian; Schmidt, Piet O. (College Park, MD : American Physical Society, 2015)
    Cold molecular ions are promising candidates in various fields ranging from precision spectroscopy and test of fundamental physics to ultracold chemistry. Control of internal and external degrees of freedom is a prerequisite ...
  • Vitagliano, G.; Apellaniz, Iagoba; Kleinmann, M.; Lücke, Bernd; Klempt, Carsten; Toth, Geza (Bristol : Institute of Physics Publishing, 2017)
    We present criteria to detect the depth of entanglement in macroscopic ensembles of spin-j particles using the variance and second moments of the collective spin components. The class of states detected goes beyond traditional ...
  • Roy Chaudhuri, A.; Fissel, Andreas; Osten, Hans Jörg (Cambridge : Cambridge University Press, 2017)
    Epitaxial layers of insulating binary lanthanide oxides have been considered as potential alternative to conventional SiO2 for gate dielectric application in future Si-based MOSFET devices, which was investigated in more ...
  • Corgier, R.; Amri, S.; Herr, W.; Ahlers, H.; Rudolph, J.; Guéry-Odelin, D.; Rasel, Ernst Maria; Charron, E.; Gaaloul, Naceur (Bristol : Institute of Physics Publishing, 2018)
    We present a detailed theoretical analysis of the implementation of shortcut-to-adiabaticity protocols for the fast transport of neutral atoms with atom chips. The objective is to engineer transport ramps with durations ...
  • Aspelmeyer, Marcus; Brukner, Časlav; Giulini, Domenico; Milburn, Gerard (Bristol : IOP Publishing Ltd., 2017)
    The interplay between quantum theory and gravity remains one of the least explored fields of physics. The current 'focus on' collection summarises experimental and theoretical results from many of the leading groups around ...
  • Arndt, Markus; Bassi, Angelo; Giulini, Domenico; Heidmann, Antoine; Raimond, Jean-Michel (Amsterdam : Elsevier BV, 2011)
    We discuss recent studies on the foundations of quantum physics with photonic, atomic, molecular and micromechanical systems as well as theoretical treatments of the interface between quantum physics and classical observations. ...
  • Hohls, Frank; Zeitler, U.; Haug, Rolf J. (College Park, MD : American Physical Society, 2001)
    The frequency dependence of the longitudinal conductivity σxx for frequencies up to 6 GHz was measured. It was possible to access both the real part and the imaginary part of σxx which allowed to perform a new test of ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...