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Visar resultat 6 - 10 av 19 uppsatser som matchar ovanstående sökkriterier.

  1. 6. Niobium Ohmic Contacts for Cryogenic Indium Phosphide High-Electron-Mobility Transistors

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Linnéa Bendrot; [2022]
    Nyckelord :Ohmic contacts; high-electron-mobility transistor; InP; Nb films; cryogenic electronics; low-noise amplifier; quantum computing; transfer length method; superconductivity; contact barrier resistance; Ohmska kontakter; högelektronmobilitetstransistorer; indiumfosfid; niob; tunnfilm; kryogen elektronik; lågbrusförstärkare; kvantdatorer; Transfer Length-metod; supraledning; kontakt- barriärresistans;

    Sammanfattning : Ohmic contacts are crucial components in semiconductor devices such as transistors and diodes, and lowering their contact resistance is an important factor in device performance enhancement. This is especially important for low-noise amplifiers (LNAs) where device noise temperature decreases both directly and indirectly with decreasing contact resistance. LÄS MER

  3. 7. Laser cooling, state initialization and laser manipulation of a trapped ion

    Kandidat-uppsats, Stockholms universitet/Fysikum

    Författare :Julius Andersson; [2021]
    Nyckelord :Ion trap; Quantum computer;

    Sammanfattning : One way of realizing a quantum computer is to use an ion trap. The research group Trapped Ion Quantum Technologies at Stockholm university were operating an ion trap with strontium ions. To increase the coherence time they installed a magnetic field shielding. Therefore the experimental setup had to be partially rebuilt. LÄS MER

  4. 8. Study of the vibronic mixing in chlorophylls with multidimensional spectroscopy

    L3-uppsats, Lunds universitet/Kemiska institutionen

    Författare :Ignacio Martínez Casasús; [2021]
    Nyckelord :Two-dimensional spectroscopy; Ultrafast spectroscopy; Chlorophyll a; Chlorophylls; Photosynthesis; Light harvesting; Vibronic mixing; Quantum coherence; Chemical physics; Chemistry;

    Sammanfattning : Chlorophylls comprise one of the most important families of molecules for the photosynthetic process. Chlorophyll-like molecules have been classically interpreted under the Gouterman model, being thought to feature two independent transitions, Qy(S1) and Qx(S2). LÄS MER

  5. 9. Adiabatic Shortcut to Geometric Quantum Computation in Noiseless Subsystems

    Kandidat-uppsats, Uppsala universitet/Materialteori

    Författare :Anton Gregefalk; [2021]
    Nyckelord :Quantum computer; Spin echo; Adiabatic shortcut; Berry s phase; Noiseless subsystems; Kvantdator; spinn eko; adiabatisk genväg; Berrys fas; Brusfria delsystem;

    Sammanfattning : Quantum computers can theoretically perform certain tasks which classical computers at realistic times could not. Operating a quantum computer requires precise control over the system, for instance achieved by adiabatic evolution, and isolation from the environment to retain coherence. LÄS MER

  7. 10. Active Phase Compensation in a Fiber-Optical Mach-Zehnder Interferometer

    Master-uppsats, Linköpings universitet/Informationskodning

    Författare :Joakim Argillander; [2020]
    Nyckelord :phase stability; interferometer; quantum key distribution; fpga; automatic control; fasstabilitet; interferometer; kvantnyckeldistribution; fpga; reglerteknik;

    Sammanfattning : This thesis investigates the phenomena of phase stability in a fiber-optical MZI (Mach-Zehnder Interferometer). The MZI is a key building block of optical systems for use in experiments with both continuous-wave light and with single photons. LÄS MER