Browsing by Subject "quantum mechanics"

Sort by: Order: Results:

  • Kiukas, J.; Lahti, P.; Schultz, J.; Werner, R.F. (College Park, MD : American Institute of Physics, 2012)
    In the nonrelativistic setting with finitely many canonical degrees of freedom, a shift-covariant phase space observable is uniquely characterized by a positive operator of trace one and, in turn, by the Fourier-Weyl ...
  • Busch, Paul; Lahti, Pekka; Werner, Reinhard F. (College Park, MD : American Physical Society, 2014)
    Recent years have witnessed a controversy over Heisenberg’s famous error-disturbance relation. Here the conflict is resolved by way of an analysis of the possible conceptualizations of measurement error and disturbance in ...
  • Hohls, Frank; Zeitler, U.; Haug, Rolf J. (College Park, MD : American Physical Society, 2002)
    We analyze the conductance fluctuations observed in the quantum Hall regime for a bulk two-dimensional electron system in a Corbino geometry. We find that characteristics like the power spectral density and the temperature ...
  • Junge, M.; Navascues, M.; Palazuelos, C.; Perez-Garcia, D.; Scholz, V. B.; Werner, R.F. (College Park, MD : American Institute of Physics, 2011)
    We show that Tsirelson's problem concerning the set of quantum correlations and Connes' embedding problem on finite approximations in von Neumann algebras (known to be equivalent to Kirchberg's QWEP conjecture) are essentially ...
  • Beer, Kerstin; Osborne, Tobias J. (College Park, MD : American Physical Society, 2018)
    Contextuality describes the local consistency but global inconsistency of data. In this paper, we review and generalize the bundle diagram representation introduced in [S. Abramsky, R. S. Barbosa, K. Kishida, R. Lal, and ...
  • Furrer, F.; Franz, T.; Berta, M.; Leverrier, A.; Scholz, V. B.; Tomamichel, M.; Werner, R.F. (College Park, MD : American Physical Society, 2012)
    We provide a security analysis for continuous variable quantum key distribution protocols based on the transmission of two-mode squeezed vacuum states measured via homodyne detection. We employ a version of the entropic ...
  • Farrelly, Terry (Bristol : IOP Publishing Ltd., 2016)
    Finding equilibration times is a major unsolved problem in physics with few analytical results. Here we look at equilibration times for quantum gases of bosons and fermions in the regime of negligibly weak interactions, a ...
  • Fühner, C.; Keyser, U.F.; Haug, Rolf J.; Reuter, D.; Wieck, A.D. (College Park, MD : American Physical Society, 2002)
    We investigate a lateral semiconductor quantum dot with a large number of electrons in the limit of strong coupling to the leads. A Kondo effect is observed and can be tuned in a perpendicular magnetic field. This Kondo ...
  • Reimer, Christian; Kues, Michael; Roztocki, Piotr; Wetzel, Benjamin; Grazioso, Fabio; Little, Brent E.; Chu, Sai T.; Johnston, Tudor; Bromberg, Yaron; Caspari, Lucia; Moss, David J.; Morandotti, Roberto (Washington D.C. : American Association for the Advancement of Science, 2016)
    Complex optical photon states with entanglement shared among several modes are critical to improving our fundamental understanding of quantum mechanics and have applications for quantum information processing, imaging, and ...
  • Busch, Paul; Lahti, Pekka; Werner, Reinhard F. (College Park, MD : American Physical Society, 2014)
    Reports on experiments recently performed in Vienna [Erhard et al., Nature Phys. 8, 185 (2012)] and Toronto [Rozema et al., Phys. Rev. Lett. 109, 100404 (2012)] include claims of a violation of Heisenberg's error-disturbance ...
  • Räsänen, E.; Könemann, J.; Haug, Rolf J.; Puska, M.J.; Nieminen, R.M. (College Park, MD : American Physical Society, 2004)
    We have studied the single-electron transport spectrum of a quantum dot in GaAs/AlGaAs resonant tunneling device. The measured spectrum has irregularities indicating a broken circular symmetry. We model the system with an ...
  • Großardt, André (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2013)
    [no abstract]
  • Nauen, A.; Hapke-Wurst, I.; Hohls, Frank; Zeitler, U.; Haug, Rolf J.; Pierz, Klaus (College Park, MD : American Physical Society, 2002)
    We investigate the noise properties of a GaAs-AlAs-GaAs tunneling structure with embedded self-assembled InAs quantum dots in the single-electron tunneling regime. We analyze the dependence of the relative noise amplitude ...
  • Keil, Robert; Zopf, Michael; Chen, Yan; Höfer, B.; Zhang, Jiaxiang; Ding, Fei; Schmidt, Oliver G. (London : Nature Publishing Group, 2017)
    Semiconductor InAs/GaAs quantum dots grown by the Stranski-Krastanov method are among the leading candidates for the deterministic generation of polarization-entangled photon pairs. Despite remarkable progress in the past ...
  • Schwonnek, René; Dammeier, Lars; Werner, Reinhard F. (College Park, MD : American Physical Society, 2017)
    Quantifying quantum mechanical uncertainty is vital for the increasing number of experiments that reach the uncertainty limited regime. We present a method for computing tight variance uncertainty relations, i.e., the ...
  • Godzik, G.; Block, T.; Pfnür, Herbert (College Park, MD : American Physical Society, 2004)
    In this study, carried out by analysis of intensities and spot profiles in low energy electron diffraction, we investigated the influence of electronegative oxygen atoms as dopants on the long range order, the thermal ...
  • Hefter, E.F. (Berlin, Boston : De Gruyter, 1982)
    A slight and natural extension of the traditional Korteweg-de Vries equation (KdV) allows all (or groups) of its solitons to have the same velocity thus facilitating the application of the KdV to realistic quantum mechanical ...
  • Kleinmann, M.; Osborne, Tobias J.; Scholz, Volkher B.; Werner, Albert H. (College Park, MD : American Physical Society, 2013)
    What singles out quantum mechanics as the fundamental theory of nature? Here we study local measurements in generalized probabilistic theories (GPTs) and investigate how observational limitations affect the production of ...
  • Dammeier, Lars; Schwonnek, René; Werner, Reinhard F. (Bristol : Institute of Physics Publishing, 2015)
    In this work we study various notions of uncertainty for angular momentum in the spin-s representation of SU(2). We characterize the 'uncertainty regions' given by all vectors, whose components are specified by the variances ...