Search for dissertations about: "Open Quantum Systems"

Showing result 1 - 5 of 33 swedish dissertations containing the words Open Quantum Systems.

  1. 1. Open Quantum Systems Effects in Interferometry, Quantum Computation, and Adiabatic Evolution

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Johan Åberg; Uppsala universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Open Systems; Completely Positive Maps; Channels; Decoherence; Quantum Information; Quantum Computing; Adiabatic Approximation; Quantum Search; Time-Complexity; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Abstract : The effects of open system evolution on single particle interferometry, quantum computation, and the adiabatic approximation are investigated.Single particle interferometry: Three concepts concerning completely positive maps (CPMs) and trace preserving CPMs (channels), named subspace preserving (SP) CPMs, subspace local channels, and gluing of CPMs, are introduced. READ MORE

  2. 2. Quantum Resources for Efficient Excitation Energy Transfer in Natural and Artificial Pigment-Protein Molecular Aggregates

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Charlotta Bengtson; Uppsala universitet.; [2018]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum coherence; quantum correlations; quantum nonlocality; open quantum systems; non-Markovian dynamics; Kemi med inriktning mot kvantkemi; Chemistry with specialization in Quantum Chemistry;

    Abstract : Recently, long-lasting quantum effects in a number of photosynthetic complexes, which are pigment-protein molecular aggregates (PPMAs), were experimentally verified. These findings created an interest in trying to connect the known highly efficient excitation energy transfer (EET) in these systems to the existence of quantum effects such as quantum coherence and quantum correlations. READ MORE

  3. 3. Superconducting qubits - measurement, entanglement, and noise

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lars Tornberg; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum Electric Circuits; Open Quantum Systems; Quantum Optics; Quantum Computing; Superconducting Qubits; Quantum Measurement;

    Abstract : In the early 1980’s, it was suggested that a computer obeying the laws of quantum mechanics would be able to solve problems beyond the capabilities of a classical computer. The novel ways in which such a quantum computer works relies on the quantum properties of the quantum bits (qubits) used to store the information. READ MORE

  4. 4. Spin splitting in open quantum dots and related systems

    University dissertation from Institutionen för teknik och naturvetenskap

    Author : Martin Evaldsson; Igor Zozoulenko; Igor Abrikosov; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; mesoscopic systems; 2DEG; ballistic transport; quantum dots; spin-polarised transport in quantum dots; spontanueous spin-splitting; NATURAL SCIENCES Physics Condensed matter physics Mesoscopic physics; NATURVETENSKAP Fysik Kondenserade materiens fysik Mesoskopisk fysik;

    Abstract : This thesis addresses electron spin phenomena in semi-conductor quantum dots/anti-dots from a computational perspective. In the first paper (paper I) we have studied spin-dependent transport through open quantum dots, i.e., dots strongly coupled to their leads, within the Hubbard model. READ MORE

  5. 5. Resonances, dissipation and decoherence in exotic and artificial atoms

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Mikhail Genkin; Stockholms universitet.; [2010]
    Keywords : quantum dissipation; quantum decoherence; open quantum systems; resonances; fysik; Physics;

    Abstract : There are several reasons why exotic and artificial atoms attract the interest of different scientific communities.In exotic atoms, matter and antimatter can coexist for surprisingly long times. Thus, they present a unique natural laboratory for high precision antimatter studies. READ MORE