Sökning: "Quantum Electric Circuits"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Quantum Electric Circuits.

  1. 1. Parametrically pumped superconducting circuits

    Författare :Philip Krantz; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SQUID; circuit quantum electrodynamics; Josephson junction; Superconducting circuits; resonators; parametric oscillators; quantum bit; pumpistor; quantum information;

    Sammanfattning : In this licentiate thesis, I present the design, fabrication, and characterization of superconducting parametric resonators, for use in quantum information processing. These devices are quarter-wavelength coplanar waveguide resonators (~5 GHz), terminated at one end by a non-linear inductance provided by a SQUID (superconducting quantum interference device). LÄS MER

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

    Författare :Lars Tornberg; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quantum Electric Circuits; Open Quantum Systems; Quantum Optics; Quantum Computing; Superconducting Qubits; Quantum Measurement;

    Sammanfattning : 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. LÄS MER

  4. 3. Towards measuring quantum sound

    Författare :Maria Ekström; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; surface acoustic wave; interdigital transducer; artificial atom; qubit; superconducting circuits; cryogenic temperature; phonon; gigahertz frequency; quantum acoustics; unidirectional transducer;

    Sammanfattning : One of the most fundamental phenomena occurring in nature is the interaction between single atoms and electromagnetic fields. This is studied in quantum optics to probe the quantum nature of the system. In appended Paper I, we demonstrated that an artificial atom can couple to propagating sound, which is the acoustic analogue of quantum optics. LÄS MER

  5. 4. Quantum acoustics with propagating phonons

    Författare :Maria Ekström; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; phonon router; phonon; quantum acoustics; interdigital transducer; Electromagnetically Induced Transparency; artificial atom; Surface acoustic wave; superconducting circuits; qubit; unidirectional transducer;

    Sammanfattning : Surface acoustic waves (SAWs) are mechanical vibrations that propagate on the surface of solids while dissipating little power, consequently enabling them to propagate freely over long distances. The speed and wavelength of SAWs are reduced a five order of magnitude compared to when light is used as a carrier at gigahertz frequencies. LÄS MER

  7. 5. Probing quantum and classical noise in nano circuits

    Författare :Arsalan Pourkabirian; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; transmon; vacuum fluctuations; circuit-QED; SET; dynamical Casimir effect; two-level fluctuator; artificial atom; SQUID; charge noise;

    Sammanfattning : This thesis presents measurements of classical and quantum noise in nano circuits.The first part of the thesis, covers extensive measurements on charge noise sources.Low-frequency charge noise with the power spectrum close to 1/f(wherefis thefrequency) has been observed in a variety of systems. LÄS MER