Auflistung nach Schlagwort "Quantum theory"

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  • Absence of Localization in Two-Dimensional Clifford Circuits 
    Farshi, Tom; Richter, Jonas; Toniolo, Daniele; Pal, Arijeet; Masanes, Lluis (College Park, MD : American Physical Society, 2023)
    We analyze a Floquet circuit with random Clifford gates in one and two spatial dimensions. By using random graphs and methods from percolation theory, we prove in the two-dimensional (2D) setting that some local operators ...
  • Application of Born series for modeling of Mie-resonant nanostructures 
    Ustimenko, N.; Kornovan, D.; Baryshnikova, K.V.; Evlyukhin, A.B.; Petrov, M. (Bristol : IOP Publ., 2021)
    Born series formalism is a widely-used approach to solve a scattering problem in quantum mechanics and optics, including a problem of electromagnetic scattering on the ensembles of Mie-resonant nanoparticles. In the latter ...
  • Applying the variational principle to (1+1) dimensional relativistic quantum field theories 
    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 ...
  • Atom-interferometric test of the universality of gravitational redshift and free fall 
    Ufrecht, Christian; Di Pumpo, Fabio; Friedrich, Alexander; Roura, Albert; Schubert, Christian; Schlippert, Dennis; Rasel, Ernst M.; Schleich, Wolfgang P.; Giese, Enno (College Park, MD : APS, 2020)
    Introducing internal-state transitions simultaneously on each branch of a light-pulse atom interferometer, we propose a scheme that is concurrently sensitive to both violations of the universality of free fall and gravitational ...
  • Competing redox reactions in Fe-containing AlO(OH) and Al2O 3 matrices: A combined investigation by Mössbauer, ESR spectroscopy and thermal analysis 
    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 ...
  • Coupling in concentric double quantum rings 
    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 ...
  • 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 ...
  • 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 ...
  • Direct measurement of the g factor of composite fermions 
    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 ...
  • Dissociation and ionization of HeH+in sub-cycle-controlled intense two-color fields 
    Oppermann, F.; Wustelt, P.; Florin, T.; Mhatre, S.; Gräfe, S.; Paulus, G.G.; Lein, M. (Bristol : Institute of Physics Publishing, 2020)
    Using quantum-mechanical, one-dimensional, non-Born-Oppenheimer simulations we study the control over the strong-field dynamics of the helium hydride molecular ion HeH+ due to interaction driven by short and strong two-color ...
  • Dynamical scaling of the quantum Hall plateau transition 
    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 ...
  • Dynamics of ferrocene in molecular sieves probed by Mossbauer spectroscopy and nuclear resonant scattering 
    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 ...
  • Efficient sympathetic motional-ground-state cooling of a molecular ion 
    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 ...
  • Eigenvalue measurement of topologically protected edge states in split-step quantum walks 
    Nitsche, Thomas; Geib, Tobias; Stahl, Christoph; Lorz, Lennart; Cedzich, Christopher; Barkhofen, Sonja; Werner, Reinhard F; Silberhorn, Christine (Bristol : Institute of Physics Publishing, 2019)
    We study topological phenomena of quantum walks by implementing a novel protocol that extends the range of accessible properties to the eigenvalues of the walk operator. To this end, we experimentally realise for the first ...
  • Entanglement and extreme spin squeezing of unpolarized states 
    Vitagliano, Giuseppe; 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 ...
  • Epitaxial lanthanide oxide thin films on Si for high-k gate dielectric application: Growth optimization and defect passivation 
    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 ...
  • Fast manipulation of Bose-Einstein condensates with an atom chip 
    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 ...
  • Focus on gravitational quantum physics 
    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 ...
  • Fundamental frontiers of quantum science and technology 
    Arndt, Markus; Bassi, Angelo; Giulini, Domenico; Heidmann, Antoine; Raimond, Jean-Michel (Amsterdam [u.a.] : Elsevier, 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. ...
  • High frequency conductivity in the quantum Hall regime 
    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 ...