Results 81 to 90 of about 858,600 (285)

Deformed Wigner crystal in a one-dimensional quantum dot

, 2019
The spatial Fourier spectrum of the electron density distribution in a finite 1D system and the distribution function of electrons over single-particle states are studied in detail to show that there are two universal features in their behavior, which ...
G. D. Mahan, G. H. Golub, M. Schlosshauer, O. A. Starykh, V. A. Sablikov, Yasha Gindikin   +5 more
core   +1 more source

Wigner distribution functions for complex dynamical systems: The emergence of the Wigner-Boltzmann equation [PDF]

Physical Review E, 2013
The equation of motion for the reduced Wigner function of a system coupled to an external quantum system is presented for the specific case when the external quantum system can be modeled as a set of harmonic oscillators. The result is derived from the Wigner function formulation of the Feynman-Vernon influence functional theory.
Sels, Dries, Brosens, Fons
openaire   +4 more sources

Comparison of DeePMD, MTP, GAP, ACE and MACE Machine‐Learned Potentials for Radiation‐Damage Simulations: A User Perspective

Advanced Intelligent Discovery, EarlyView.
The authors evaluated six machine‐learned interatomic potentials for simulating threshold displacement energies and tritium diffusion in LiAlO2 essential for tritium production. Trained on the same density functional theory data and benchmarked against traditional models for accuracy, stability, displacement energies, and cost, Moment Tensor Potential ...
Ankit Roy, Ram Devanathan, Sarah Allec, Giridhar Nandipati, Andrew M. Casella, David J. Senor, Duane D. Johnson, Ganesh Balasubramanian, Ayoub Soulami   +8 more
wiley   +1 more source

Robust Time-Frequency Distributions with Complex-Lag Argument

EURASIP Journal on Advances in Signal Processing, 2010
The robust time-frequency distributions with complex-lag argument are proposed. They can provide an accurate estimation of fast varying instantaneous frequency in the presence of noise with heavy-tailed probability density function.
Srdjan Stanković, Irena Orović, Nikola Žarić   +2 more
doaj   +2 more sources

Negative Wigner function at telecommunication wavelength from homodyne detection

, 2017
Quantum states of light having a Wigner function with negative values represent a key resource in quantum communication and quantum information processing. Here, we present the generation of such a state at the telecommunication wavelength of 1550nm. The
Baune, Christoph, Fiurasek, Jaromir, Schnabel, Roman   +2 more
core   +1 more source

Synthetic Electrocardiogram Spectrogram Generation Using Generative Adversarial Network‐Based Models: A Comparative Study

Advanced Intelligent Systems, EarlyView.
Cardiovascular diseases are leading death causes; electrocardiogram (ECG) analysis is slow, motivating machine learning and deep learning. This study compares deep convolutional generative adversarial network, conditional GAN, and Wasserstein GAN with gradient penalty (WGAN‐GP) for synthetic ECG spectrograms; Fréchet Inception Distance (FID) and ...
Giovanny Barbosa‐Casanova, Norelli Schettini, Winston Percybrooks, Begoña García‐Zapirain   +3 more
wiley   +1 more source

Symplectic evolution of Wigner functions in markovian open systems

, 2004
The Wigner function is known to evolve classically under the exclusive action of a quadratic hamiltonian. If the system does interact with the environment through Lindblad operators that are linear functions of position and momentum, we show that the ...
A. Isar, A. M. Ozorio de Almeida, A. Voros, A.M. Ozorio de Almeida, A.M. Ozorio de Almeida, G. Lindblad, G. Lindblad, G.S. Agarwal, H. Moya-Cessa, H.J. Groenewold, K. Husimi, L. Diósi, M.S. Kim, O. Brodier, P. Leboeuf, R.G. Littlejohn, T. Kiss, U. Leonhardt, V. Bargmann, V. Bargmann, V.I. Tatarskiĭ, W.H. Zurek   +21 more
core   +1 more source

Wigner negativity, random matrices and gravity

Journal of High Energy Physics
Given a choice of an ordered, orthonormal basis for a D-dimensional Hilbert space, one can define a discrete version of the Wigner function — a quasi-probability distribution which represents any quantum state as a real, normalized function on a discrete
Ritam Basu, Pratyusha Chowdhury, Anirban Ganguly, Souparna Nath, Onkar Parrikar, Suprakash Paul   +5 more
doaj   +1 more source

Efficient Dynamics: Reduced‐Order Modeling of the Time‐Dependent Schrödinger Equation

Advanced Physics Research, EarlyView.
Reduced‐order modeling (ROM) approaches for the time‐dependent Schrödinger equation are investigated, highlighting their ability to simulate quantum dynamics efficiently. Proper Orthogonal Decomposition, Dynamic Mode Decomposition, and Reduced Basis Methods are compared across canonical systems and extended to higher dimensions.
Kolade M. Owolabi
wiley   +1 more source

Scalar quantum kinetic theory for spin-1/2 particles: mean field theory

, 2009
Starting from the Pauli Hamiltonian operator, we derive a scalar quantum kinetic equations for spin-1/2 systems. Here the regular Wigner two-state matrix is replaced by a scalar distribution function in extended phase space.
Abramowitz M, Ballentine L E, Bertotti G, Bogolyubov N N, Bogolyubov N N, Bonitz M, Cohen L, De Groot S R, Drake R P, Eliezer S, G Brodin, Haug H, Husimi K, J Zamanian, Kadanoff L P, Keldysh L P, Keldysh L P, Landau L D, Leonhardt U, M Marklund, Maier S A, Manfredi G, Marklund M, Pethick C J, Radcliffe J M, Shukla P K Eliasson B, Stancil D D, Stratonovic R L, Stratonovic R L, Swanson D G, Weyl H, Wigner E   +31 more
core   +1 more source