Sökning: "Quantum Electric Circuits"

Visar resultat 6 - 10 av 10 avhandlingar innehållade orden Quantum Electric Circuits.

  1. 6. Probing quantum and classical noise in nano circuits

    Författare :Arsalan Pourkabirian; Chalmers tekniska högskola; []
    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

  3. 7. Transport phenomena in quantum wells and wires in presence of disorder and interactions

    Författare :Valeria Vettchinkina; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; time-dependent density-functional theory; disorder; electron correlation; Lowdimensional semiconducting systems; transport phenomena; Fysicumarkivet F:2012:Vettchinkina;

    Sammanfattning : Present-day electronics employ circuits of smaller and smaller dimensions, and today the length scales are so small that the laws of physics which rule micro-cosmos, quantum mechanics, become directly important. This thesis reports on theoretical work on electron transport in different nanostructures. LÄS MER

  4. 8. Fractal superconducting resonators for the interrogation of two-level systems

    Författare :Sebastian Erik de Graaf; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cooper-pair box; decoherence; electron spin resonance; two-level systems; atomic force microscopy; quasiparticles; near-field scanning microwave microscopy; Superconducting resonators; circuit quantum electrodynamics;

    Sammanfattning : In this thesis we use high-Q superconducting thin-film microwave resonators to interact with several types of quantum mechanical two-level systems. Such a resonator is used as the central building block in a cryogenic near-field scanning microwave microscope (NSMM) to reach a completely new regime of NSMM operation. LÄS MER

  5. 9. Probing Electron Collisions in Nanostructures

    Författare :Fikeraddis Damtie; Matematisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electron-electron interaction; Time dependent dynamics; Multiple Exciton Generation; Two dimensional spectroscopy; Fysicumarkivet A:2017:Damtie;

    Sammanfattning : This thesis studies the role of interaction between charged particles for transport and optical properties in nanostructures. Simulations are provided for a quantitative description of the system dynamics probed by either current spectroscopy or light absorption. LÄS MER

  7. 10. Studies of acoustic waves, noise and charge pumping using single-electron devices

    Författare :Martin Gustafsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; single-electron pump; single-electron transistor; surface acoustic wave; single-electron devices; charge pumping; TLF; SINIS turnstile; electrometer; two-level fluctuator; single-photon detector; noise; SAW; SET;

    Sammanfattning : This thesis covers a range of experiments on single-electron devices, electrical circuits that utilize the discreetness of the electron charge. The Single-Electron Transistor (SET) is of special importance among these, being the most sensitive electrometer demonstrated, and sufficiently mature to serve as a building block in sensors and detectors for physical phenomena that can be transformed into charge signals. LÄS MER