Auflistung nach Schlagwort "Hilbert space"

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  • 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 ...
  • Extremal Quantum Correlations and Cryptographic Security 
    Franz, T.; Furrer, F.; Werner, R.F. (College Park, MD : American Physical Society, 2011)
    We investigate a fundamental property of device-independent security in quantum cryptography by characterizing probability distributions which are necessarily independent of the measurement results of any eavesdropper. We ...
  • Nucleon-deuteron scattering with Δ-isobar excitation: Perturbation theory 
    Deltuva, A.; Chmielewski, K.; Sauer, P.U. (College Park, MD : American Physical Society, 2003)
    A perturbative approach for the description of elastic and inelastic nucleon-deuteron scattering is developed. Its validity is discussed. The aim of the perturbative approach is the isolation of details of different reaction ...
  • Quantum Walks with Nonorthogonal Position States 
    Matjeschk, R.; Ahlbrecht, Andre; Enderlein, M.; Cedzich, C.; Werner, A.H.; Keyl, M.; Schaetz, T.; Werner, R.F. (College Park, MD : American Physical Society, 2012)
    Quantum walks have by now been realized in a large variety of different physical settings. In some of these, particularly with trapped ions, the walk is implemented in phase space, where the corresponding position states ...
  • S matrix from matrix product states 
    Vanderstraeten, Laurens; Haegeman, Jutho; Osborne, Tobias J.; Verstraete, Frank (College Park, MD : American Physical Society, 2014)
    We use the matrix product state formalism to construct stationary scattering states of elementary excitations in generic one-dimensional quantum lattice systems. Our method is applied to the spin-1 Heisenberg antiferromagnet, ...
  • 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 ...
  • Systematic investigation of three-nucleon force effects in elastic scattering of polarized protons from deuterons at intermediate energies 
    Ermisch, K.; Amir-Ahmadi, H.R.; Van Den Berg, A.M.; Castelijns, R.; Davids, B.; Deltuva, A.; Epelbaum, E.; Glöckle, W.; Golak, J.; Harakeh, M.N.; Hunyadi, M.; De Huu, M.A.; Kalantar-Nayestanaki, N.; Kamada, H.; Ki, M.; Mahjour-Shafiei, M.; Nogga, A.; Sauer, P.U.; Skibinski, R.; Witala, H.; Wörtche, H.J. (College Park, MD : American Physical Society, 2005)
    The question, whether the high-quality nucleon-nucleon potentials can successfully describe the three-nucleon system, and to what extent three-nucleon forces (3NFs) play a role, has become very important in nuclear few-body ...