Sökning: "Wigner function"

Hittade 4 uppsatser innehållade orden Wigner function.

  1. 1. Optimal Multitaper Spectrograms

    Master-uppsats, Lunds universitet/Matematisk statistik

    Författare :Markus Ydreskog; [2023]
    Nyckelord :Time-frequency analysis; Multitaper spectrogram; Optimization; Wigner distribution; Mathematics and Statistics;

    Sammanfattning : Multitaper spectrograms have been proposed as a method of improving the spectrogram as a time-frequency representation (TFR). This thesis aimed to investigate both previously used and new methods for combining multitaper spectrograms of a Gaussian signal and a chirp. LÄS MER

  3. 2. LPI waveforms for AESA radar

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Fasta tillståndets elektronik

    Författare :Andreas Sjöberg; [2020]
    Nyckelord :Radar LPI waveform AESA;

    Sammanfattning : The purpose of low probability of intercept (LPI) radar is, on top of the standard requirements on a radar, to remain undetected by hostile electronic warfare (EW) systems. This can be achieved primarily by reducing the amount of radiated power in any given direction at all times and is done by transmitting longer modulated pulses that can then be compressed digitally in order to retain range resolution. LÄS MER

  4. 3. Continuous-variable quantum annealing with superconducting circuits

    Master-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

    Författare :Pontus Vikstål; [2018]
    Nyckelord :quantum annealing; adiabatic quantum computing; continuous variables; coherent states; Wigner function; superconducting circuits; Kerr-nonlinear resonator.;

    Sammanfattning : Quantum annealing is expected to be a powerful generic algorithm for solving hard combinatorial optimization problems faster than classical computers. Finding the solution to a combinatorial optimization problem is equivalent to finding the ground state of an Ising Hamiltonian. LÄS MER

  5. 4. Investigating the GW self-energy of the homogeneous electron gas in real space

    Master-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Zhen Zhao; [2018]
    Nyckelord :GW method; self energy; screened-exchange; Coulomb-hole; Physics and Astronomy;

    Sammanfattning : The real space behavior of the GW self-energy in the electron gas model was investigated in this thesis work. The self-energy is naturally decomposed into the screened-exchange and the Coulomb-hole components. LÄS MER