Sökning: "quantum computation"

Visar resultat 1 - 5 av 41 avhandlingar innehållade orden quantum computation.

  1. 1. Quantum Holonomies : Concepts and Applications to Quantum Computing and Interferometry

    Författare :David Kult; Erik Sjöqvist; Gunnar Björk; Barry Sanders; Uppsala universitet; []
    Nyckelord :Physics; Quantum Holonomy; Geometric Phase; Quantum Computation; Completely Positive Map; Mixed State; Interferometry; Fysik;

    Sammanfattning : Quantum holonomies are investigated in different contexts.A geometric phase is proposed for decomposition dependent evolution, where each component of a given decomposition of a mixed state evolves independently. It is shown that this geometric phase only depends on the path traversed in the space of decompositions. LÄS MER

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

    Författare :Johan Åberg; Erik Sjöqvist; Sten Lunell; Vlatko Vedral; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Physics; Open Systems; Completely Positive Maps; Channels; Decoherence; Quantum Information; Quantum Computing; Adiabatic Approximation; Quantum Search; Time-Complexity; Fysik; Physics; Fysik;

    Sammanfattning : 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. LÄS MER

  3. 3. Quantum Holonomy for Many-Body Systems and Quantum Computation

    Författare :Vahid Azimi Mousolou; Erik Sjöqvist; Rosario Fazio; Linnéuniversitetet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Quantum holonomy; geometric phase; quantum correlations; quantum phase transitions; quantum computation; Natural Science; Naturvetenskap; Physics; Fysik;

    Sammanfattning : The research of this Ph. D. thesis is in the field of Quantum Computation and QuantumInformation. A key problem in this field is the fragile nature of quantum states. LÄS MER

  4. 4. Entanglement and Quantum Computation from a Geometric and Topological Perspective

    Författare :Markus Johansson; Marie Ericsson; Jens Eisert; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Quantum Information; Geometric Phases; Topological Phases; Entanglement; Quantum Computation;

    Sammanfattning : In this thesis we investigate geometric and topological structures in the context of entanglement and quantum computation.A parallel transport condition is introduced in the context of Franson interferometry based on the maximization of two-particle coincidence intensity. LÄS MER

  5. 5. Geometric and Topological Phases with Applications to Quantum Computation

    Författare :Marie Ericsson; Ignacio Cirac; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Physics; geometric phases; topological phases; quantum computation; mixed states; completely positive maps; Fysik; Physics; Fysik; fysik; Physics;

    Sammanfattning : Quantum phenomena related to geometric and topological phases are investigated. The first results presented are theoretical extensions of these phases and related effects. Also experimental proposals to measure some of the described effects are outlined. LÄS MER