Browsing by Subject "quantum information"

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  • Disturbed witnesses in quantum complexity theory 
    Dziemba, Friederike Anna (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2019)
    QMA is the complexity class of computational problems that are efficiently verifiable by a quantum algorithm with the help of a witness in contrast to the smaller class BQP of problems efficiently solvable by a quantum ...
  • 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 ...
  • Generalised versions of separable decompositions applicable to bipartite entangled quantum states 
    Anwar, Hussain; Jevtic, Sania; Rudolph, Oliver; Virmani, Shashank ([Bad Honnef] : Dt. Physikalische Ges., 2019)
    The investigation of separable states in quantum theory has been driven by the notion that they are highly classical, in that they do not demonstrate nonlocality, and are in some contexts unable to support non-classical ...
  • Inferring effective field observables from a discrete model 
    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 ...
  • Jones index, secret sharing and total quantum dimension 
    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 ...
  • Kohärente und dissipative Präparation von Quantenzuständen 
    Weimer, Hendrik (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)
    In den letzten Jahren wurden bei der Kontrolle von Quantenzuständen einzelner Atome, Moleküle und Spins in Festkörpern bahnbrechende Erfolge erzielt, und sogar quantenmechanische Verschränkung zwischen einzelnen Quantenobjekten ...
  • The renormalization group via statistical inference 
    Beny, Cedric; Osborne, Tobias J. (Bristol : IOP Publishing Ltd., 2015-08-05)
    In physics, one attempts to infer the rules governing a system given only the results of imperfect measurements. Hence, microscopic theories may be effectively indistinguishable experimentally. We develop an operationally ...
  • Squeezed light at 1064 nm and 1550 nm with a nonclassical noise suppression beyond 10 dB 
    Mehmet, Moritz (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2012)
    [no abstract]
  • Über die Struktur von verschränkten Zuständen 
    Karnas, Siniša (Hannover : Universität, 2001)
    [no abstract]