Sökning: "Cooper-pair box"

Visar resultat 6 - 10 av 11 avhandlingar innehållade orden Cooper-pair box.

  1. 6. Controllable coupling of superconducting qubits and implementation of quantum gate protocols

    Författare :Margareta Wallquist; Chalmers tekniska högskola; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  3. 7. Read-out of superconducting qubits - a quantum measurement process

    Författare :Lars Tornberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; superconducting qubits; single Cooper Pair box; quantum measurements; quantum electrical circuits; quatum computing;

    Sammanfattning : In this work we consider measurements on quantum systems emphasizingon read-out of superconducting qubits. The qubit is always coupled to anenvironment, containing a macroscopic number of degrees of freedom. Thisperturbs the qubit and destroys the phase coherence of the quantum state. LÄS MER

  4. 8. Studies on hybrid superconducting junctions

    Författare :Cecilia Holmqvist; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Critical Current; Single-Electron Box; Attractive Correlations; Josephson Junction; Negative Charging Energy; Quasiclassical Superconductivity; Josephson Current;

    Sammanfattning : In the field of nanoelectronics, one seeks to combine quantum mechanical effects with macroscopic entities such as currents in order to find new ways of storing and manipulating information. One possibility to accomplish this is to use the quantum correlations found in superconductors. LÄS MER

  5. 9. Superconducting Qubits: Charge read-out and backaction

    Författare :Andreas Käck; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : For quantum computers to become reality, not only do the qubits have to be carefully engineered to be well isolated during operation time, but this also puts great strain on the measurement setup. We have looked at the backaction from a single-electron transistor (SET), operated both in the normal and in the superconducting state, on a single Cooper-pair box qubit. LÄS MER

  7. 10. Fast-tunable resonators and quantum electrical circuits

    Författare :Martin Sandberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SEB; tunable; Sisyphus resistance; CPW; Resonator; SCB; qubit; circuit-QED; transmon; SQUID;

    Sammanfattning : In this thesis, measurements on superconducting electrical circuits that exhibit quantum mechanical effects are presented. Nonlinear superconducting circuits can be regarded as artificial atoms with energy spectra that can be engineered. The artificial atoms can be used as quantum bits for quantum computation. LÄS MER