Search for dissertations about: "quantum correction"

Showing result 1 - 5 of 31 swedish dissertations containing the words quantum correction.

  1. 1. Quantum error correction

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

    Abstract : 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. READ MORE

  2. 2. On the role of the electron-electron interaction in two-dimensional quantum dots and rings

    Author : Erik Waltersson; Eva Lindroth; Stephanie Reimann; Stockholms universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; quantum dot; quantum ring; quantum dot molecule; electronic structure; two-dimensional; many-body physics; many-body perturbation theory; coupled cluster; coupled cluster singles and doubles; quantum logical gates; quantum computing; quantum control; quantum control algorithm; Electronic structure; Elektronstruktur; Physics; fysik;

    Abstract : Many-Body Perturbation Theory is put to test as a method for reliable calculations of the electron-electron interaction in two-dimensional quantum dots. We show that second order correlation gives qualitative agreement with experiments on a level which was not found within the Hartree-Fock description. READ MORE

  3. 3. Quantum error correction

    Author : Jonas Almlöf; Gunnar Björk; Marcin Swillo; Jan-Åke Larsson; KTH; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Abstract : Quantum error correction is the art of protecting quantum states from the detrimental influence from the environment. To master this art, one must understand how the system interacts with the environment and gives rise to a full set of quantum phenomena, many of which have no correspondence in classical information theory. READ MORE

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

    Author : Lars Tornberg; Chalmers University of Technology; []
    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

  5. 5. Measurement Back-Action and Photon Detection in Microwave Quantum Optics

    Author : Anton Frisk Kockum; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Parity Measurement; Quantum Measurement; Quantum Optics; Quantum Stochastic Calculus; Circuit QED; Photodetection; Transmon; Dephasing;

    Abstract : In quantum optics, the interaction between atoms and photons is studied. In recent years, microwave quantum optics with superconducting circuits has emerged as an important tool for fundamental quantum optics experiments, and also as a promising way for implementing quantum computation. READ MORE