Now showing items 1-16 of 16

    • Creation of arbitrary Dicke and NOON states of trapped-ion qubits by global addressing with composite pulses 

      Ivanov, Svetoslav Stoychev; Vitanov, Nikolay V.; Korolkova, Natalia (2013-02-25) - Journal article
      We propose a fast and efficient technique to create classes of highly entangled states of trapped ions, such as arbitrary Dicke states and superpositions of them, e.g. NOON states. The ions are initialized in the phonon ...
    • Cross-phase modulation in rubidium-87 

      Sinclair, Gary F. (University of St Andrews, 2009-06-26) - Thesis
      This thesis explores the theoretical foundations of cross-phase modulation (XPM) between optical fields in the N-configuration atom. This is the process by which the refractive index experienced by one field can be modulated ...
    • Dissipatively coupled waveguide networks for coherent diffusive photonics 

      Mukherjee, Sebabrata; Mogilevtsev, Dmitri; Slepyan, Gregory Ya.; Doherty, Thomas H.; Thomson, Robert R.; Korolkova, Natalia (2017-12-04) - Journal article
      A photonic circuit is generally described as a structure in which light propagates by unitary exchange and transfers reversibly between channels. In contrast, the term ‘diffusive’ is more akin to a chaotic propagation in ...
    • Distributing entanglement with separable states 

      Peuntinger, Christian; Chille, Vanessa; Mišta, Jr., Ladislav; Korolkova, Natalia; Förtsch, Michael; Korger, Jan; Marquardt, Christoph; Leuchs, Gerd (2013-12-04) - Journal article
      Like a silver thread, quantum entanglement [1] runs through the foundations and breakthrough applications of quantum information theory. It cannot arise from local operations and classical communication (LOCC) and therefore ...
    • Enhancing student learning of two-level quantum systems with interactive simulations 

      Kohnle, Antje; Baily, Charles; Campbell, Anna; Korolkova, Natalia; Paetkau, Mark (2015-06) - Journal article
      The QuVis Quantum Mechanics Visualization project aims to address challenges of quantum mechanics instruction through the development of interactive simulations for the learning and teaching of quantum mechanics. In this ...
    • The enigma of imaging in the Maxwell fisheye medium 

      Sahebdivan(i), Sahar (University of St Andrews, 2016-11-30) - Thesis
      The resolution of optical instruments is normally limited by the wave nature of light. Circumventing this limit, known as the diffraction limit of imaging, is of tremendous practical importance for modern science and ...
    • Entanglement concentration with quantum nondemolition Hamiltonians 

      Tatham, Richard; Korolkova, Natalia (2014-01-09) - Journal article
      We devise and examine two procrustean entanglement concentration schemes using quantum nondemolition (QND) interaction Hamiltonians in the continuous variable regime, applicable for light, for atomic ensembles or in a ...
    • Entangling the whole by beam splitting a part 

      Croal, Callum; Peuntinger, Christian; Chille, Vanessa; Marquardt, Christoph; Leuchs, Gerd; Korolkova, Natalia; Mišta Jr., Ladislav (2015-11-04) - Journal article
      A beam splitter is a basic linear optical element appearing in many optics experiments and is frequently used as a continuous-variable entangler transforming a pair of input modes from a separable Gaussian state into an ...
    • Free-space quantum signatures using heterodyne measurements 

      Croal, Callum; Peuntinger, Christian; Heim, Bettina; Khan, Imran; Marquardt, Christoph; Leuchs, Gerd; Wallden, Petros; Andersson, Erika; Korolkova, Natalia (2016-09-02) - Journal article
      Digital signatures guarantee the authorship of electronic communications. Currently used "classical" signature schemes rely on unproven computational assumptions for security, while quantum signatures rely only on the laws ...
    • Gaussian non-classical correlations in bipartite dissipative continuous variable quantum systems 

      Quinn, Niall (University of St Andrews, 2015-06-24) - Thesis
      This thesis probes the usefulness of non-classical correlations within imperfect continuous variable decoherent quantum systems. Although a consistent function and practical usefulness of these correlations is largely ...
    • Nonlinear dissipation can combat linear loss 

      Mogilevtsev, D.; Mikhalychev, A.; Shchesnovich, V. S.; Korolkova, Natalia (2013-06-28) - Journal article
      For nonclassical state generation, we demonstrate the possibility to compensate effects of strong linear loss by engineered nonlinear dissipation. We show that it is always possible to construct such a dissipative gadget ...
    • Procrustean entanglement concentration, weak measurements and optimized state preparation for continuous-variable quantum optics 

      Menzies, David (University of St Andrews, 2009-06-26) - Thesis
      In this thesis, we are concerned with continuous-variable quantum optical state engineering protocols. Such protocols are designed to repair or enhance the nonclassical features of a given state. In particular, we build ...
    • Quantum correlations in and beyond quantum entanglement in bipartite continuous variable systems 

      Tatham, Richard (University of St Andrews, 2012-11-30) - Thesis
      This thesis explores the role of non-classical correlations in bipartite continuous variable quantum systems, and the approach taken is three-fold. We show that given two initially entangled atomic ensembles, it is possible ...
    • Quantum correlations in continuous variable mixed states : from discord to signatures 

      Croal, Callum (University of St Andrews, 2016-11-30) - Thesis
      This thesis studies continuous variable mixed states with the aim of better understanding the fundamental behaviour of quantum correlations in such states, as well as searching for applications of these correlations. I ...
    • Surprises in theoretical Casimir physics : quantum forces in inhomogeneous media 

      Simpson, William M. R. (University of St Andrews, 2014-06-25) - Thesis
      This thesis considers the problem of determining Casimir-Lifshitz forces in inhomogeneous media. The ground-state energy of the electromagnetic field in a piston-geometry is discussed. When the cavity is empty, the ...
    • Towards universal quantum computation in continuous-variable systems 

      Milne, Darran F. (University of St Andrews, 2012-11-30) - Thesis
      In this thesis we explore the possibility of creating continuousvariable quantum systems that are capable of supporting universal quantum computation. We begin by examining the measurement-based model, which employs ...