Sökning: "Kvantinformation"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet Kvantinformation.

  1. 1. A Classical-Light Attack on Energy-Time Entangled Quantum Key Distribution, and Countermeasures

    Författare :Jonathan Jogenfors; Jan-Åke Larsson; Arnt Inge Vistnes; Linköpings universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Quantum Key Distribution; Energy-Time Entanglement; Quantum Information; Kvantkryptering; Energi-Tid-Snärjning; Kvantinformation;

    Sammanfattning : Quantum key distribution (QKD) is an application of quantum mechanics that allowstwo parties to communicate with perfect secrecy. Traditional QKD uses polarization of individual photons, but the development of energy-time entanglement could lead to QKD protocols robust against environmental effects. LÄS MER

  2. 2. Quantum error correction

    Författare :Jonas Almlöf; Gunnar Björk; Jan-Åke Larsson; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; quantum error correction; dissipative channel; decoherence; fidelity; mutual information;

    Sammanfattning : This thesis intends to familiarise the reader with quantum error correction, and also show some relations to the well known concept of information - and the lesser known quantum information. Quantum information describes how information can be carried by quantum states, and how interaction with other systems give rise to a full set of quantum phenomena, many of which have no correspondence in classical information theory. LÄS MER

  3. 3. Semiconductor Quantum Optics at Telecom Wavelengths

    Författare :Katharina Zeuner; Val Zwiller; Klaus D. Jöns; Stephan Reitzenstein; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Optics and Photonics; Optik och fotonik;

    Sammanfattning : Quantum technologies are an expanding field in physics and engineering concerning the development of protocols and devices that enable augmented or novel applications based on quantum mechanics. This includes amongst others quantum computation and quantum communication. LÄS MER

  4. 4. Entanglement detection schemes and coherent manipulation of spin in quantum dots

    Författare :Ognjen Malkoc; NanoLund; []
    Nyckelord :Quantum dots; Entanglement; Current noise; Spin relaxation; Fysicumarkivet A:2016:Malkoc;

    Sammanfattning : The work contained in this thesis deals with two closely related topics. Papers I-III deal with charge transport statistics in nanoscale devices to investigate the presence of entanglement in the constituent electrons. We identify the contributions of entangled electron pairs to the current cross-correlations as a signature of entanglement. LÄS MER

  5. 5. Coherent Interactions in Rare-Earth-Ion-Doped Crystals for Applications in Quantum Information Science

    Författare :Mattias Nilsson; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; quantum optics; relaxation; magnetic resonance; supraconductors; magnetic and optical properties; electrical; Condensed matter:electronic structure; Atom- och molekylärfysik; optical information processing; coherence in solids; Atomic and molecular physics; rare-earth-ion-doped crystals; magnetisk resonans; spektroskopi; supraledare; magnetiska och optiska ; egenskaper elektriska; Kondenserade materiens egenskaper:elektronstruktur; spectroscopy; quantum information;

    Sammanfattning : This thesis describes investigations of the use of cryogenically cooled rare-earth-ion-doped crystals for quantum information processing and quantum optics. Several aspects of the coherent interaction between light and rare-earth ions in solids are addressed. Quantum information science has given physicists new views of quantum mechanics. LÄS MER