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  • Quantum metrology using tailored non-classical states 
    Junker, Jonas (Hannover : Institutionelles Repositorium der Leibniz Unversität Hannover, 2023)
    Squeezed states of light play a significant role in various technologies ranging from high-precision metrology such as gravitational wave detection to quantum information.These quantum states are prepared to carry particular ...
  • Quantum metrology with Einstein-Podolsky-Rosen entangled atoms 
    Kruse, Ilka (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2015)
    [no abstract]
  • Quantum metrology with squeezed and entangled light for the detection of gravitational waves 
    Steinlechner, Sebastian (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2013)
    [no abstract]
  • Quantum nanofriction in trapped ion chains with a topological defect 
    Timm, L.; Rüffert, L.A.; Weimer, H.; Santos, L.; Mehlstäubler, T.E. (College Park, MD : APS, 2021)
    Trapped ion systems constitute a well controllable scenario for the study and emulation of nanofriction, and in particular of Frenkel-Kontorova-like models. This is in particular the case when a topological defect is created ...
  • Quantum neural networks 
    Beer, Kerstin (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2022)
    Quantum computing is one of the most exciting research areas of the last decades. At the same time, methods of machine learning have started to dominate science, industry and our everyday life. In this thesis we combine ...
  • Quantum noise cancellation in asymmetric speed metres with balanced homodyne readout 
    Zhang, T.; Knyazev, E.; Steinlechner, S.; Khalili, F.Y.; Barr, B. W.; Bell, A. S.; Dupej, P.; Briggs, J.; Graf, C.; Callaghan, J.; Hennig, J. S.; Houston, E. A.; Huttner, S. H.; Leavey, S.S.; Pascucci, D.; Sorazu, B.; Spencer, A.; Wright, J.; Strain, K.A.; Hild, S.; Danilishin, S.L. (Bristol : IOP Publishing Ltd., 2018)
    The Sagnac speed metre topology has been identified as a promising technique to reduce quantum back-action in gravitational-wave interferometers. However, imbalance of the main beamsplitter has been shown to increase the ...
  • Quantum noise limits to simultaneous quadrature amplitude and phase stabilization of solid-state lasers 
    Huntington, E.H.; Harb, C.C.; Heurs, Michèle; Ralph, T.C. (College Park, MD : American Physical Society, 2007)
    A quantum mechanical model is formulated to describe the coupling between pump intensity noise and laser frequency noise in a solid-state laser. The model allows us to investigate the limiting effects of closed-loop ...
  • Quantum Otto heat engine based on a multiferroic chain working substance 
    Azimi, M.; Chotorlishvili, L.; Mishra, S.K.; Vekua, Teimuraz; Huebner, W.; Berakdar, J. (Bristol : IOP Publishing Ltd., 2014-06-12)
    We study a quantum Otto engine operating on the basis of a helical spin-1/2 multiferroic chain with strongly coupled magnetic and ferroelectric order parameters. The presence of a finite spin chirality in the working ...
  • Quantum phases of a chain of strongly interacting anyons 
    Finch, Peter E.; Frahm, Holger; Lewerenz, Marius; Milsted, Ashley; Osborne, Tobias J. (College Park (Maryland) : American Physical Society, 2014)
    Quantum gates for the manipulation of topological qubits rely on interactions between non-Abelian anyonic quasiparticles. We study the collective behavior of systems of anyons arising from such interactions. In particular, ...
  • Quantum Physics at School—What do Teachers need? Results of a Delphi Study 
    Weber, Kim-Alessandro; Friege, Gunnar; Scholz, Rüdiger (Berlin [u.a.] : Springer, 2020)
    Quantum physics is considered to be equally important and challenging for teaching physics at school. This paper aims to provide an empirical basis for the construction of guidelines for a teacher training course on quantum ...
  • Quantum sensing of oscillating electric fields with trapped ions 
    Wolf, Fabian; Schmidt, Piet O. ([London] : Elsevier Ltd., 2021)
    Quantum noise is a fundamental limitation for quantum sensors and results in the so-called shot-noise limit. Nowadays, several systems such as optical clocks or gravitational wave detectors approach measurement sensitivities ...
  • Quantum simulation of Abelian gauge fields with ultracold gases 
    Cardarelli, Lorenzo (Hannover : Repositorium der Leibniz Universität Hannover, 2019)
    Gauge theories are ubiquitous in physics. Many intriguing phenomena in condensed matter physics owe to the action of the electromagnetic field, which is an Abelian gauge theory. The numerical treatment of many-body systems ...
  • Quantum stability of Mott-insulator states of ultracold atoms in optical resonators 
    Larson, Jonas; Fernandez-Vidal, Sonia; Morigi, Giovanna; Lewenstein, Maciej (Bristol : IOP Publishing Ltd., 2008)
    We investigate a paradigm example of cavity quantum electrodynamics with many body systems: an ultracold atomic gas inside a pumped optical resonator, confined by the mechanical potential emerging from the cavity-field ...
  • Quantum SU(2|1) supersymmetric Calogero-Moser spinning systems 
    Fedoruk, Sergey; Ivanov, Evgeny; Lechtenfeld, Olaf; Sidorov, Stepan (Heidelberg : Springer Verlag, 2018)
    SU(2|1) supersymmetric multi-particle quantum mechanics with additional semi-dynamical spin degrees of freedom is considered. In particular, we provide an N= 4 supersymmetrization of the quantum U(2) spin Calogero-Moser ...
  • Quantum suppression of irregularity in the spectral properties of the kicked rotator 
    Frahm, Holger; Mikeska, H.J. (College Park (Maryland) : American Physical Society, 1988)
    The statistical properties of the quasienergy spectrum are used to measure the influence of quantum effects on the quantum kicked rotator which displays chaotic behavior in the classical limit. A transition from ...
  • Quantum switches and quantum memories for matter-wave lattice solitons 
    Ahufinger, V.; Mebrahtu, A.; Corbalan, R.; Sanpera, A. (Bristol : IOP Publishing Ltd., 2007)
    We study the possibility of implementing a quantum switch and a quantum memory using matter-wave lattice solitons and making them interact with 'effective' potentials (barrier/well) corresponding to defects of the optical ...
  • Quantum technological applications using dissipative many-body dynamics 
    Raghunandan, Meghana (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2020)
    Quantum systems cannot always be treated as isolated from their surroundings since this is an idealization which is not always true. Though theoretical analysis of open quantum systems poses great challenges as one needs ...
  • Quantum technologies in space 
    Kaltenbaek, Rainer; Acin, Antonio; Bacsardi, Laszlo; Bianco, Paolo; Bouyer, Philippe; Diamanti, Eleni; Marquardt, Christoph; Omar, Yasser; Pruneri, Valerio; Rasel, Ernst M.; Sang, Bernhard; Seidel, Stephan; Ulbricht, Hendrik; Ursin, Rupert; Villoresi, Paolo; van den Bossche, Mathias; Klitzing, Wolf von; Zbinden, Hugo; Paternostro, Mauro; Bassi, Angelo (Dordrecht [u.a.] : Springer Science + Business Media B.V., 2021)
    Recently, the European Commission supported by many European countries has announced large investments towards the commercialization of quantum technology (QT) to address and mitigate some of the biggest challenges facing ...
  • The quantum technologies roadmap: A European community view 
    Acín, Antonio; Bloch, Immanuel; Buhrman, Harry; Calarco, Tommaso; Eichler, Christopher; Eisert, Jens; Esteve, Daniel; Gisin, Nicolas; Glaser, Steffen J.; Jelezko, Fedor; Kuhr, Stefan; Lewenstein, Maciej; Riedel, Max F.; Schmidt, Piet O.; Thew, Rob; Wallraff, Andreas; Walmsley, Ian; Wilhelm, Frank K. (Bristol : Institute of Physics Publishing, 2018)
    Within the last two decades, quantum technologies (QT) have made tremendous progress, moving from Nobel Prize award-winning experiments on quantum physics (1997: Chu, Cohen-Tanoudji, Phillips; 2001: Cornell, Ketterle, ...
  • Quantum teleportation in space and frequency using entangled pairs of photons from a frequency comb 
    Song, Hongbin; Yonezawa, Hidehiro; Kuntz, Katanya B.; Heurs, Michèle; Huntington, Elanor H. (College Park, MD : American Physical Society, 2014)
    Using entangled pairs of photons from a frequency comb and wide-band frequency-resolved homodyne detection, we propose a sequential quantum teleportation protocol for continuous variables that teleports an unknown state ...