Search for dissertations about: "superconducting junctions"

Showing result 21 - 25 of 70 swedish dissertations containing the words superconducting junctions.

  2. 21. Quantum optics in superconducting circuits : Generating, engineering and detecting microwave photons

    Author : Sankar Raman Sathyamoorthy; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; single photon source; superconducting circuits; single photon detector; cross-Kerr effect; Quantum optics; circuit QED;

    Abstract : Quantum optics in superconducting circuits, known as circuit QED, studies the interaction of photons at microwave frequencies with artificial atoms made of Josephson junctions. Although quite young, remarkable progress has been made in this field over the past decade, especially given the interest in building a quantum computer using superconducting circuits. READ MORE

  4. 22. Controllable coupling of superconducting qubits and implementation of quantum gate protocols

    Author : Margareta Wallquist; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Controllable Qubit-Coupling; Single Cooper-Pair Box; Josephson Effect; Quantum Gate; Superconducting Circuit; Quantum Computer; Qubit; Quantum Electrical Circuit;

    Abstract : The concept of a quantum computer was invented in the beginning of the 1980s as a quantum generalization of the reversible classical computer. After discoveries in the middle of the 1990s of quantum algorithms, which wouldsolve some problems considered intractable for classical computers, the field of quantum computing has developed rapidly. READ MORE

  5. 23. Fine Scale Microstructures of Josephson Junctions in YBa2Cu3O7-δ Thin Film Structures

    Author : Marica Gustafsson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; superconductors; thin film evolution; microstructure; nucleation; Josephson junctions; multilayer; YBa2Cu3O7-delta; transmission electron microscopy;

    Abstract : This work concerns the microstructure of YBa2Cu3O7-.delta. (YBCO) and other related thin films in multilayer structures, studied by mainly transmission electron microscopy (TEM). READ MORE

  6. 24. Ramp Josephson junctions based on NdBa2Cu3O7-δ electrodes and PrBa2Cu3O7-δ barriers

    Author : Mikael Sjöstrand; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PBCO; high temperature; superconducting device; ramp Josephson junction; NBCO; pulsed laser deposition; thin film;

    Abstract : We report on smooth high quality c-axis orientedNdBa2Cu3O7-δ (NBCO) superconducting thin filmsgrown on (001) SrTiO3 substrates using pulsed laser deposition.The transition temperature of these NBCO films was around 89.5 Kand the root-mean-square (RMS) surface roughness was 0.75 nm for150 nm thick films. READ MORE

  7. 25. Bi2212 intrinsic Josephson junctions, fabrication and high frequency properties

    Author : Mattias Torstensson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; intrinsic Joule heating; Shapiro steps; in plane critical current; Bi2212; high temperature superconductors; intrinsic Josephson junctions;

    Abstract : The objective for this work was to investigate the high-frequency properties of Bi2212 intrinsic Josephson junctions (IJJ’s). Particularly, the possibility to reach the THz range with a SIS mixer is theoretically promising due to the high energy gap of Bi2212. READ MORE