Auflistung nach Schlagwort "quantum mechanics"

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  • A space-based quantum gas laboratory at picokelvin energy scales 
    Gaaloul, Naceur; Meister, Matthias; Corgier, Robin; Pichery, Annie; Boegel, Patrick; Herr, Waldemar; Ahlers, Holger; Charron, Eric; Williams, Jason R.; Thompson, Robert J.; Schleich, Wolfgang P.; Rasel, Ernst M. ([London] : Nature Publishing Group UK, 2022)
    Ultracold quantum gases are ideal sources for high-precision space-borne sensing as proposed for Earth observation, relativistic geodesy and tests of fundamental physical laws as well as for studying new phenomena in ...
  • Characterization of informational completeness for covariant phase space observables 
    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 ...
  • Colloquium: Quantum root-mean-square error and measurement uncertainty relations 
    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 ...
  • Conductance fluctuations at the quantum Hall plateau transition 
    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 ...
  • Connes' embedding problem and Tsirelson's problem 
    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 ...
  • Contextuality and bundle diagrams 
    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 ...
  • Continuous Variable Quantum Key Distribution: Finite-Key Analysis of Composable Security against Coherent Attacks 
    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 ...
  • Device-independent quantum key distribution with random key basis 
    Schwonnek, René; Goh, Koon Tong; Primaatmaja, Ignatius W.; Tan, Ernest Y.-Z.; Wolf, Ramona; Scarani, Valerio; Lim, Charles C.-W. ([London] : Nature Publishing Group UK, 2021)
    Device-independent quantum key distribution (DIQKD) is the art of using untrusted devices to distribute secret keys in an insecure network. It thus represents the ultimate form of cryptography, offering not only ...
  • Equilibration of quantum gases 
    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 ...
  • The Extended Korteweg-de Vries Equation 
    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 ...
  • Flux-quantum-modulated Kondo conductance in a multielectron quantum dot 
    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 ...
  • Generation of multiphoton entangled quantum states by means of integrated frequency combs 
    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 ...
  • Heisenberg uncertainty for qubit measurements 
    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 ...
  • Impurity effects in quantum dots: Toward quantitative modeling 
    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 ...
  • Many-body bound states and induced interactions of charged impurities in a bosonic bath 
    Astrakharchik, Grigory E.; Ardila, Luis A. Peña; Jachymski, Krzysztof; Negretti, Antonio ([London] : Nature Publishing Group UK, 2023)
    Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this ...
  • One-dimensional confinement and width-dependent bandgap formation in epitaxial graphene nanoribbons 
    Karakachian, Hrag; Nguyen, T.T. Nhung; Aprojanz, Johannes; Zakharov, Alexei A.; Yakimova, Rositsa; Rosenzweig, Philipp; Polley, Craig M.; Balasubramanian, Thiagarajan; Tegenkamp, Christoph; Power, Stephen R.; Starke, Ulrich (London : Nature Publishing Group, 2020)
    The ability to define an off state in logic electronics is the key ingredient that is impossible to fulfill using a conventional pristine graphene layer, due to the absence of an electronic bandgap. For years, this property ...
  • Die Schrödinger-Newton-Gleichung als Modell selbstgravitierender Quantensysteme 
    Großardt, André (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2013)
    [no abstract]
  • Shot noise in self-assembled InAS quantum dots 
    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 ...
  • Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions 
    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 ...
  • State-independent Uncertainty Relations and Entanglement Detection in Noisy Systems 
    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 ...